如图将正方形ABCD绕点A顺时针旋转角度α(0°<α<90°)得到正方形AB′C′D′.
(1)如图1,B′C′与AC交于点M,C′D′与AD所在直线交于点N,若MN∥B′D′,求α;
(2)如图2,C′B′与CD交于点Q,延长C′B′与BC交于点P,当α=30°时.
①求∠DAQ的度数;
②若AB=6,求PQ的长度.
(1)如图1,B′C′与AC交于点M,C′D′与AD所在直线交于点N,若MN∥B′D′,求α;
(2)如图2,C′B′与CD交于点Q,延长C′B′与BC交于点P,当α=30°时.
①求∠DAQ的度数;
②若AB=6,求PQ的长度.
![](https://img.xkw.com/dksih/QBM/2020/4/24/2448515862249472/2449162325221376/STEM/6d245326d08a4b099a5f3e14fb4773bc.png?resizew=336)
2020·辽宁沈阳·一模 查看更多[3]
更新时间:2020-04-25 16:56:25
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解答题-证明题
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【推荐1】[问题解决]
(1)如图①,在矩形纸片ABCD中,E是BC边的中点,将△ABE沿AE折叠得到△AFE,点B的对应点F恰好落在AD边上,请你判断四边形ABEF的形状,并说明理由;
[问题探索]
(2)如图②,在矩形纸片ABCD中,E是BC边的中点,将△ABE沿AE折叠得到△AFE,点B的对应点F在矩形纸片ABCD的内部,延长AF交CD于点G,求证:FG=CG;
[拓展应用]
(3)如图③,在正方形纸片ABCD中,E是BC边的中点,将△ABE沿AE折叠得到△AFE,点B的对应点F落在正方形纸片ABCD内,延长AF交CD于点G,若AB=4,求线段FG的长.
(1)如图①,在矩形纸片ABCD中,E是BC边的中点,将△ABE沿AE折叠得到△AFE,点B的对应点F恰好落在AD边上,请你判断四边形ABEF的形状,并说明理由;
[问题探索]
(2)如图②,在矩形纸片ABCD中,E是BC边的中点,将△ABE沿AE折叠得到△AFE,点B的对应点F在矩形纸片ABCD的内部,延长AF交CD于点G,求证:FG=CG;
[拓展应用]
(3)如图③,在正方形纸片ABCD中,E是BC边的中点,将△ABE沿AE折叠得到△AFE,点B的对应点F落在正方形纸片ABCD内,延长AF交CD于点G,若AB=4,求线段FG的长.
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939618207211520/2942495638151168/STEM/3bea63660672438f86773842cca42670.png?resizew=498)
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【推荐2】已知,四边形
是菱形.
,
是等边三角形,点E,点F分别在边
,
上,连接
,对角线
与
交于点G.若E是
边中点,求证:
;
(2)如图2,若
,
是等边三角形,点E,点F分别在边
,
上,连接
,对角线
与
交于点G.请写出
与
的数量关系并说明理由;
(3)如图3,若
,
是等边三角形,点E,点F,点G分别在边
,
,
上,且
,
,请直接写出
的长为__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a69fb0f913ed3433ab322593f46a116.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a145c1f02b833c483ab17a90eb6521a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d553751992a6f76b80327a1f88da5539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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名校
解题方法
【推荐1】如图1,正方形
和正方形
,连接
.
绕点
旋转,如图2,线段
与
之间有怎样的关系?请说明理由;
(2)[探究]:如图3,若四边形
与四边形
都为矩形,且
,
,猜想
与
的关系,并说明理由;
(3)[应用]:在(2)情况下,连接
点
在
上方
,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37911e56b9180699c76cc0eba7fe5c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9941b969048c0478a9d4116bfe4c6c32.png)
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad56938ea04db4e90efb3f29c1b6b41a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935ad59079c158ea0f92018fc548e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad56938ea04db4e90efb3f29c1b6b41a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935ad59079c158ea0f92018fc548e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(2)[探究]:如图3,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad56938ea04db4e90efb3f29c1b6b41a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7857c420475037df2d59cfb0b9179820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbfa10e6ad585d6c274ff205c7157223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935ad59079c158ea0f92018fc548e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(3)[应用]:在(2)情况下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c673ce9cb2410c3640c15f1def3edf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37911e56b9180699c76cc0eba7fe5c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9941b969048c0478a9d4116bfe4c6c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/563fc0e0b9ef2136d6d994a9f186adda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935ad59079c158ea0f92018fc548e4a.png)
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解答题-作图题
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名校
【推荐2】已知正方形
,将边
绕点
顺时针旋转
至线段
,
的角平分线所在直线与直线
相交于点
.过点
作直线
的垂线
,垂足为点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/d53b1259-ae7f-4e57-958e-346e62fedc0b.png?resizew=168)
(1)当
为锐角时,依题意补全图形,并直接写出
的度数;
(2)在(1)的条件下,写出线段
和
之间的数量关系,并证明;
(3)设直线
与直线
相交于点
,若
,直接写出线段
长的最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/d53b1259-ae7f-4e57-958e-346e62fedc0b.png?resizew=168)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
(2)在(1)的条件下,写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
(3)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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【推荐3】特例发现:
如图1,点E和点F分别为正方形ABCD边BC和边CD上一点,当CE=CF时,则易得BE=DF,BE⊥DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/80ec1853-6240-4943-9bdc-2be1f7975706.png?resizew=416)
(1)如图2,点E为正方形ABCD内一点,且∠ECF=90°,CF=CE,点E,F在直线CD的两侧,连接EF,BE,DF,探究线段BE与DF之间的关系,并说明理由;
(2)如图3,在矩形ABCD中,AB∶BC=1∶2,点E在矩形ABCD内部,∠ECF=90°,点E,F在直线BC的两侧,CE∶CF=1∶2,连接EF,BE,DE,BF,DF.请探究线段DE,BF之间的关系,并说明理由;
(3)若(2)中矩形ABCD的边AB=3,Rt△CEF的边CE=1,当BE=DF时,求BF的长.
如图1,点E和点F分别为正方形ABCD边BC和边CD上一点,当CE=CF时,则易得BE=DF,BE⊥DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/80ec1853-6240-4943-9bdc-2be1f7975706.png?resizew=416)
(1)如图2,点E为正方形ABCD内一点,且∠ECF=90°,CF=CE,点E,F在直线CD的两侧,连接EF,BE,DF,探究线段BE与DF之间的关系,并说明理由;
(2)如图3,在矩形ABCD中,AB∶BC=1∶2,点E在矩形ABCD内部,∠ECF=90°,点E,F在直线BC的两侧,CE∶CF=1∶2,连接EF,BE,DE,BF,DF.请探究线段DE,BF之间的关系,并说明理由;
(3)若(2)中矩形ABCD的边AB=3,Rt△CEF的边CE=1,当BE=DF时,求BF的长.
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【推荐1】如图,在边长为2的等边
中,点
为
的延长线上的一点,连接
,将
绕点A逆时针旋转
到
,连接
,过点
作
交直线
于点
.
之间的数量关系,并说明理由;
(2)求出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83eb49559eb624fe13e0f7c45cf7b67.png)
(2)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】如图1,在正方形ABCD中,
,P是AD边上一点,连接BP,将△ABP绕着点B顺时针旋转,得到
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/43a6ea09-d707-4cc2-94a0-b4782c2459ec.png?resizew=367)
(1)已知旋转角为60°,点P与D点重合(如图2).
①证明:
;
②证明:
是等腰三角形;
(2)已知旋转角为45°.
①请用无刻度的直尺和圆规,在图3上的AD边上作出一点P,使P、
、
三点在一直线上(不写作法,保留作图痕迹);
②当
是直角三角形时,求AP的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72877c13ed193e20096b533378d9c7d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/43a6ea09-d707-4cc2-94a0-b4782c2459ec.png?resizew=367)
(1)已知旋转角为60°,点P与D点重合(如图2).
①证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cb284e54c0ea9cdb2813f02b46cf383.png)
②证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19736af03116d7cf8b1ebaeda148b63d.png)
(2)已知旋转角为45°.
①请用无刻度的直尺和圆规,在图3上的AD边上作出一点P,使P、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19736af03116d7cf8b1ebaeda148b63d.png)
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【推荐1】如图1,在平行四边形
中,
,点
在射线
上运动,以点
为圆心,
长为半径的圆交射线
于点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/160b16de-0fec-48fd-a711-213c6b025518.png?resizew=417)
(1)连接
,求
的长;
(2)如图2,若点
与点
重合,求阴影部分的面积;
(3)若
与平行四边形
的边所在的直线相切,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40a85e937e9e25a42fda497aca35fe45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/160b16de-0fec-48fd-a711-213c6b025518.png?resizew=417)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,E为正方形
中
边上的一个动点,
,以
为边画正方形
与边
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/0e5378d1-e1c5-4ab2-94fb-7f9b7924c444.png?resizew=176)
(1)当
为边
的中点时,求
的长;
(2)当
时,连接
,求
的长;
(3)连接
,
,求
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b1927db96d84f27197b5a654b622f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/0e5378d1-e1c5-4ab2-94fb-7f9b7924c444.png?resizew=176)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc9f12e928cfdebd473709af1348c60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
您最近一年使用:0次