解题方法
1 . 已知下列不等式成立,求实数a的取值范围(
,且
):
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d572c662857a033fc169db5346ed282.png)
(2)
;
(3)
;
(4)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d572c662857a033fc169db5346ed282.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a546e38eed96976dca07b034e2f2c338.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55547937d78e234953627a81bc27b9d.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52aefc63f485e3f3c80059bd0fdc1742.png)
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2 . 指出下列函数的单调性:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57fcdf20c1b55322136cd97f015e0e1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026fa14f66c6bca69b94c37d37e21642.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33569967941eca435c098c3ac807c471.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d702e0e68fb66dbaf7d9de69c3fcde2b.png)
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20-21高一·江苏·课后作业
3 . 设
,
,如果函数
满足
,那么a的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ff35f3b50966a5e3cbb0b5977af7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9669d4f21732dff14dab495b09cf6cb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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20-21高一·江苏·课后作业
4 . 下列函数中,在区间
上是减函数的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8938db94f49dcbe0c383fba0241bb0da.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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