21-22高一·湖南·课后作业
1 . 判断下列命题的真假,并说明理由:
(1)若
,
是任意实数,则
;
(2)若
,
是实数且
,则
;
(3)若
,则
有两个不相等的实数根;
(4)若
有两个不相等的实数根,则实数
.
(1)若
![](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/c60fc3e9456f71b31807e17c03ea0ae9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c988d709ba8cd8aed6cb83d76c0ba89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5977232839b54df456aeeacb13512d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac671e6d87de2fb5f7ad3aab582866d.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac671e6d87de2fb5f7ad3aab582866d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
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20-21高二·全国·课后作业
2 . 1.判断下列命题的真假:
(1)如果函数
的定义域为
,且
在
上递增,在
上递减,则函数
的最大值为
.
(2)如果函数
的定义域为
,且
在
上递减,在
上递增,则函数
无最小值.
(1)如果函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99bc960e7542d1f1ada519b085a8d603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4776c85b79df196f606d3ebf3697fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d021029d216a1b24f712931ed1537d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4889b4b46d3cd6dd677d200bdf4914fe.png)
(2)如果函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a873ff69b69b5ddc3f07c705f4c597.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d1288c575c8cdce97930bc32c423b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132180f062a45a511b1fe0cef8288db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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20-21高一·江苏·课后作业
3 . 考查下述推导过程,找出错误原因.
若
,则有
,
从而有
,
即有
.
所以
.
又因为
,
所以
,
所以
.
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b9d5aaaceaa3ac514d17fcfefbf9b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24ad525829d8c106ad1a9d228ced2e2.png)
从而有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3625ca3aa3d239cc4707c5b349dba917.png)
即有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/519b90d1b4f175ff39f4eb2627fc5899.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e275b7f61c4067702f8d9c32b80e6ccb.png)
又因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b9d5aaaceaa3ac514d17fcfefbf9b4.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9afb93da541f3fce7f4e774f213b52.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df87c686d472584fedf858cad05523f1.png)
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20-21高一·江苏·课后作业
4 . 判断下列命题的真假.
(1)若
,则
;
(2)若
,则
;
(3)若
,则
;
(4)若函数
的图象经过坐标原点,则
;
(5)若
,则
;
(6)若
,则
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828765097c682c0b260c81e5bf6229a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a479511a50da604b2fc7398617db8387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6204ebd38f7dcba36e4086998680046c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6749db809dd84c2cfe5c47bea121e356.png)
(4)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ecf0250d8dc96d8ea7ac9db679abecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
(5)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37fa80a309d76305ccbd55ee6a68f709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
(6)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ecda7bfb0a2043306bf7707a136ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d465e39b5aa44efec6c6402a5795af.png)
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20-21高一·江苏·课后作业
5 . 将下列命题改写成“若p,则q”(或“如果p,那么q”)的形式.
(1)有一个内角是60°的等腰三角形是正三角形;
(2)对顶角相等;
(3)平行四边形的对角线互相平分;
(4)对角线互相平分的四边形是平行四边形.
(1)有一个内角是60°的等腰三角形是正三角形;
(2)对顶角相等;
(3)平行四边形的对角线互相平分;
(4)对角线互相平分的四边形是平行四边形.
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20-21高一·江苏·课后作业
6 . 写出下列命题的条件与结论.
(1)如果两个三角形全等,那么这两个三角形的对应高相等;
(2)如果两个三角形的两边及其夹角分别相等,那么这两个三角形全等;
(3)若一个四边形是菱形,则这个四边形的四边相等;
(4)若两条直线被一组平行线所截,则所得的对应线段成比例.
(1)如果两个三角形全等,那么这两个三角形的对应高相等;
(2)如果两个三角形的两边及其夹角分别相等,那么这两个三角形全等;
(3)若一个四边形是菱形,则这个四边形的四边相等;
(4)若两条直线被一组平行线所截,则所得的对应线段成比例.
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