(1)计算:
;
(2)化简:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ac275eb0364bc0a83e41649c00bd33.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ceace8a7209e33a1f55cfccfde1c29.png)
更新时间:2022-01-03 10:06:15
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【推荐1】已知
,设
,其中
为虚数单位,当
为何值时:
(1)在复平面上
对应的点在第二象限;
(2)在复平面上
对应的点在直线
上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1ccfb798bc2f1a5eb8beae545b998d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579743813856e2a9183f5ec6eaaefbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)在复平面上
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
(2)在复平面上
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512f4c29ff276b7f35052ad4cc255ab5.png)
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解答题-应用题
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【推荐2】某县茶叶种植历史悠久,品种繁多,自古为“贡茶之乡”.其中“雪芽绿茶”以其外形匀整、挺秀,汤色碧绿,香气浓烈等优异品质闻名遐迩,深受广大消费者青睐.经验表明,在
室温下,该茶用
的水泡制,再等到茶水温度降至
时饮用,可以产生最佳饮用口感.经过研究发现,设茶水温度从
开始,经过
分钟后的温度为
且满足
.
(1)求常数
的值;
(2)经过测试可知
,求在
室温下,刚泡好的该茶大约需要放置多长时间才能达到最佳饮用口感?(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7889f265b1bac6f19624eb93f5dbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05fb667b7a84e0dfda1407f52fe06d35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627d1038ec568d0540e3258528b2533f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13708f01d71b3172e2508af0d620572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2639cc42415e12d22b381cc0d90d7891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/371cdf3887671346df01eff9bc3b2bb1.png)
(1)求常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)经过测试可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191bcd3a8cbb3fbae49ed741bc4abc92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7889f265b1bac6f19624eb93f5dbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb814268d5309457bd9b7bea7e20c46a.png)
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解题方法
【推荐1】求下列各值.
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662a9660a659d247c7632024ebb7bbc4.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce7552fc0527cee1d98b774ed0f2509.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8469b4933ff6bd25b32c1f5a79770182.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f951f9f94e4bc41dc11e71b1635d0418.png)
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解答题-计算题
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解题方法
【推荐1】
(1)若
为第二象限角,且
,求
的值.
(2)化简:
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79167f288fce0086f3a7e36dd5bf80fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902e80ded65a4986c3d9b867c3c012e7.png)
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解题方法
【推荐2】计算求值:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e9b2f3dda7ed706efd3f3fddb00deb.png)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e9b2f3dda7ed706efd3f3fddb00deb.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71514f5b4cce50b1a2540fc814e0d16.png)
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