解题方法
1 . 下列命题中,真命题的序号是___________ .
①已知函数
满足
,则函数
:
②从分别标有
的9个完全相同的小球中不放回地随机摸球2次,每次摸球1个,则摸到的2个球上的数字奇偶性相同的概率是
;
③用数学归纳法证明“
”,由
到
时,不等式左边应添加的项是
;
④
的二项展开式中,共有3个有理项.
①已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e153aa6d3f1585585b2f6386b53046e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6404bce2a64554b209c21489b0c7c040.png)
②从分别标有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8e9adf1b75e2411ad7342389006c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d86ab7c97cd8a0b15ba5efc1be94230.png)
③用数学归纳法证明“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d152b3c0b6f2186b1a817c8fdad7b3ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef7ca2b3e8061384501f668e59696a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ba21f3d0cfc86d40e2e06446623ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a960b196accb9c715aec8ecd4acc69b8.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b8635c25c3825917cfe5f87bae997a.png)
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名校
2 . (1)用反证法证明命题“存在实数x,使得sinx=x”时,“假设”的内容是:___________ .
(2)已知命题p:∀x≥1,使得
,则
p为___________ .
(2)已知命题p:∀x≥1,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bff1a588a67b0b29fbd65b78dd68543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a45a62af2453837041c28e79295415.png)
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