已知
中,角A,B,C所对的边分别为a,b,c,且
的面积为
.
(1)若
,求
的值;
(2)当角A为何值时,
取得最大值,并求出该值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67336ccd79b321083fa8821e524c7467.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a47ec05f5c5425d47418074254dbd4e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5daacfca03b233bee267ed7410cd43c7.png)
(2)当角A为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101678e608c85bd89a7e0ae80d896646.png)
更新时间:2024-02-28 13:20:59
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】某同学用“五点法”画函数
在某一个周期的图像时,列表并填入了部分数据,如表:
选择下面三个条件之一,完成作答.
条件一:①
,②
;条件二:①
,③
;条件三:④
,⑤
.
(1)我选择条件______,请直接写出函数
的解析式和最小正周期;
(2)求函数
在
上的最值,并写出相应的
值;
(3)若对
,不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6e933c323da8610a76bdd7e1e8868a.png)
0 | |||||
① | ② | ③ | ④ | ⑤ | |
0 | 2 | 0 | -2 | 0 |
条件一:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aeb076bad84890e24dbdc945ad543cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aeb076bad84890e24dbdc945ad543cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/730511e5c675812664f9c7b297ad0a13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76dde16b05fba6fc61779511e63f34fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856408b57ec26c833422c65e58e76662.png)
(1)我选择条件______,请直接写出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b672f564d03ed46d092bb130f229ad8.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b672f564d03ed46d092bb130f229ad8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02880800c31fb84a744209cdc0ec4dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1159f4ae6d87adfd4ce3b8d958233967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ba754f7062d9335e65eddab0e6b81af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】在锐角△ABC中,
.
(1)求角A;
(2)若a
,当sinB+cos(
C)取得最大值时,求B和b.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8318e062219b1d1d086bcdd22b4d054.png)
(1)求角A;
(2)若a
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074609663cc1cfa6cf35a2ae9bfc1164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67255bca964aa78d1ada7cbddf3af6b8.png)
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【推荐1】为了美化城市空间,拓展市民公共活动场所,某市拟把一块直角三角形
空地修建成一个“口袋公园”(指规模很小的城市户外空间).建造时,须在公园内留出一块绿地(
区域),
在
上,
其余区域为休闲区.
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958759667294208/2959470087356416/STEM/1e0914f8a8bf4ea3be851833a8415ca1.png?resizew=125)
(1)当图中
三个区域的面积相等时,求绿地区域
的周长;
(2)若
,为使休闲区尽量大,设
,问
为何值时,绿地区域
的面积最小?最小面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f02028a3847c4807c2d3cf0ea7efb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18de8d74f723ffb1ba7bd48c05a70855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db32d7804f7d8be50b452ea5736b4eb.png)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958759667294208/2959470087356416/STEM/1e0914f8a8bf4ea3be851833a8415ca1.png?resizew=125)
(1)当图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d688a55ab760a7b2aa7b277f7fd1e123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f02028a3847c4807c2d3cf0ea7efb8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c3fe26b378cb2665c06c5d8039d675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb35158a52a23a6e57ff890cef8c7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f02028a3847c4807c2d3cf0ea7efb8.png)
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【推荐2】已知
在区间
上最大值为6.
(1)求
单调增区间;
(2)当
时,关于
不等式
有解,求实数
取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/265384d62ae17af01c1562581a893ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0b1b34a0cb69bd9e0a4622b6352968.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bbe6deff19943e8c12f70560ff5df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d8c2a6e934545ebb2055f83565e1fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
【推荐1】在
中,角
的对边分别为
,且满足
和
.
(1)
的大小;
(2)若
的外接圆半径
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe4d0cfca55a9129e18b65659ed5821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc2cebf064b8e7fe9955504a274ae59.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c572083c2af625b8222e19a53a5d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】在
中,A,B,C分别为边a,b,c所对的角,且满足
.
(1)求
的大小;
(2)
的角平分线
交
边于D,向量
在
上的投影向量为
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4655cb55aa9b0de6ceade057d2adc301.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/083a20abb668d4c26fe5039bd108b40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4781e3daa2c4e018ca0ae09bb56abc0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af82169030108da422584b49cfb7b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eafad11eba6974f0ba0cceb5ea757c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9e36c5987d6730e846753e0552c7d3.png)
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【推荐3】已知函数
.
(1)求函数
的最小正周期及单调递增区间;
(2)若锐角
中角A、
,
所对的边分别为
、
、
,且
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f4b1502827d92cba41aa78143917b0.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fdeba282b028321696be7f90f2cbfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3aa688caadfeb5bdf9c7dfecb5afa31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8307bb6f4a22abf0720d04d002b87d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ecc3aaae2aa289591a3b632f1e0645.png)
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解题方法
【推荐1】已知
的内角
的对边分别为
,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/970453bf-41aa-4ab4-bfef-811ed9bb77bb.png?resizew=157)
(1)求
;
(2)如图,若
,
为
外一点,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bdcc6e6be0d9f70b8f17de673a993b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/970453bf-41aa-4ab4-bfef-811ed9bb77bb.png?resizew=157)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(2)如图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc30807a82090422213b869aecc93dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解题方法
【推荐2】如图,在平面四边形ABCD中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/b28e3fad-054a-4e15-b59a-620142b6ad40.png?resizew=139)
(1)若
,求
;
(2)记
与
的面积分别记为
和
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/b28e3fad-054a-4e15-b59a-620142b6ad40.png?resizew=139)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101bb72104105c615f95d7aede1a9c29.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be89b91f05f281190209b1e876299d57.png)
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