计算:|﹣1|﹣(
﹣1)0+
÷
+(﹣
)﹣2+3tan30°.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fda303240e35a04641e7e602dcc414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
更新时间:2020-06-27 17:00:44
|
相似题推荐
解答题-问答题
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【推荐1】在解决数学问题的过程中,我们常用到“分类讨论”的数学思想,下面是运用分类讨论的数学思想解决问题的过程,请仔细阅读,并解答题目后提出的“探究”.
【提出问题】三个有理数
、
、
满足
,求
的值.
【解决问题】解:由题意得:
,
,
三个有理数都为正数或其中一个为正数,另两个为负数.
①当
,
,
都是正数,即
,
,
时,
则
;
②当
,
,
有个一为正数,另外两个为负数时,设
,
,
,
则
,
所以
的值为
或
.
【探究】请根据上面的解题思路解答下面的问题:
(1)已知三个有理数
,
,
满足
,求
;
(2)已知
,
,且
,求
的值.
【提出问题】三个有理数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce563ace106dd7eb696cf3a293d83d9c.png)
【解决问题】解:由题意得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f169f9f1c49c2dd731539d1bf686ef3.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d968edbfcc63e66ea88e8088e9f9e041.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce563ace106dd7eb696cf3a293d83d9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
【探究】请根据上面的解题思路解答下面的问题:
(1)已知三个有理数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fefef55f006747897696fe614cd877a7.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f130cb107706399a165fea630eefaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbb2d9e082462c06c281dd00cedbbcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b75bc12f0eb487db5d0388c348eacd.png)
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名校
【推荐2】已知有理数a,b,c在数轴上所对应的点分别是A、B、C三点,原点为O,点A在数轴上以每秒1个单位长度的速度运动,同时点B和点C在数轴上分别以每秒3个单位长度和n(
)个单位长度的速度运动,设运动时间为t秒.且a、b、c满足:
①
.②多项式
是关于x的二次三项式.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/925a67b1-355e-44dd-addd-b8d737250fd1.jpg?resizew=439)
(1)直接写出a,b,c的值;
(2)点P为数轴上C点右侧一点,且点P对应的数为y,化简
;
(3)若点A与点B同时相向而行,在运动到某时刻,满足
,试求运动时间t的值;
(4)若点A向左运动,同时点B和点C在数轴也向左运动,运动的过程中,当
时,那么
的值会发生变化吗?若不变,求出这个不变化的值,若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029da2067b3564cee13879e402a89a01.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dee4042040905ff9fcfee2368ac593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d90515d86025851830277d660ecf879.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/925a67b1-355e-44dd-addd-b8d737250fd1.jpg?resizew=439)
(1)直接写出a,b,c的值;
(2)点P为数轴上C点右侧一点,且点P对应的数为y,化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d988f9dc833493e7bef1885e66cacb.png)
(3)若点A与点B同时相向而行,在运动到某时刻,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
(4)若点A向左运动,同时点B和点C在数轴也向左运动,运动的过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c358db4cab3a196b8c5ea9b41e05348.png)
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【推荐2】(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954b032da934156e23452df69d589dd7.png)
(2)先化简,在
,
,0中选择一个合适的x的值代入求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954b032da934156e23452df69d589dd7.png)
(2)先化简,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0262791cc14598c6fc5ed0937d0124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1f2177095b82aa5c19ce9004b8e306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbcfc988b6f8bf4b3db50b903c338a6.png)
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【推荐1】
(1)计算:|﹣4|﹣(
)﹣2
tan30°+
.
(2)化简:
.
(1)计算:|﹣4|﹣(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae6cc893630fbc91da6855816e80a36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a196420e2005a4357d5defe64ef95a15.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b502affce8c4dcd4c90ae4b55695612.png)
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真题
【推荐1】计算:2tan60°﹣|
﹣2|﹣
+(
)﹣1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fda303240e35a04641e7e602dcc414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
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解答题-作图题
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【推荐2】已知角
,探究
与角
的关系.
两个数学兴趣小组的同学在查阅资料后,分别设计了如下两个探究方案,
方案一:如图,点
在以点
为圆心,1为半径的
上,
,设
的度数为
.作
于点
,则线段① 的长度
即为
的值.
方案二:用函数
的值近似代替
的值.计算函数
的值,并在平面直角坐标系
中描出坐标为
的点.
两个小组同学汇总、记录的部分探究数据如下表所示(确到
).
若
记为
,否则记为
.
(1)①为 ,②为 ;
(2)补全表中的
或
;
(3)画出
关于
的函数图象,并写出
的近似值(精确到
),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f1876a89632d328e0809ace0ceb2fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48345d239aaf8e9ca1ff2846c08a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
两个数学兴趣小组的同学在查阅资料后,分别设计了如下两个探究方案,
方案一:如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae728c7be0f0cf78711f3fa5ccccf30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df51f4ea4169edec76dafdeb071510dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb3874bda8f7063dafd50ec4f566121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1830ad63b26620d7f45d5bd6e742b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48345d239aaf8e9ca1ff2846c08a99.png)
方案二:用函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db0227231ab15877d707e519f82f5dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48345d239aaf8e9ca1ff2846c08a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f196f6236188084f3b2c9f2b68c05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1add0e23a7fd73b57ca8aad8fff4d5b.png)
两个小组同学汇总、记录的部分探究数据如下表所示(确到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e62648b9ece7164d91e422b7223ece80.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed47a768260d970be3e57f7f1978c2be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dcecbc2e704e8aaec3541a045d8698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
0 | 10 | 20 | 30 | 40 | 45 | 50 | 60 | 70 | 80 | 90 | |
0 | ② | 1 | |||||||||
0 | |||||||||||
|
(1)①为 ,②为 ;
(2)补全表中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dcecbc2e704e8aaec3541a045d8698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
(3)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f196f6236188084f3b2c9f2b68c05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a521f1147b1e9c58402cc7a686131e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d17c4366e6cb22fcee0f60b6a7ade5.png)
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