1 . 已知函数f(x)=ax2+bx+c(a,b,c∈R),当x∈[-1,1]时,|f(x)|≤1.
(1)求证:|b|≤1;
(2)若
,求实数a的值.
(1)求证:|b|≤1;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df97c4db5f580fea4e71e54c1c7076de.png)
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2 . 设函数
.
(1)求不等式
的解集;
(2)设
,
,
,函数
的最小值为
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4130d43842d66f72bde3ae6e7ce5c79a.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667f20b3908a42c7b822f8c7f25103f2.png)
(2)设
![](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/0f5696c598a2f97446a2b3120c478da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6919cd5b4376e7d76e3025aa561c96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132f8f79d3a8aceb3698d688589d20fa.png)
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2019-10-23更新
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6卷引用:天一大联考2019-2020学年高中毕业班阶段性测试(一)理科数学试题