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已知函数f(x)=xlnx(e为无理数,e=2.718) (I)求函数f(x)在点(e,f(e))处的切线方程; (Ⅱ)若k为正整数,且f(k)>(k﹣1)x﹣k对任意x>l恒成立,求k的最大值...
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高三上学期数学《》真题及答案
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下列说法中正确的是
是一个无理数
函数
的自变量x的取值范围是x>1
8的立方根是±2
若点P(﹣2,a)和点Q(b,﹣3)关于x轴对称,则a+b的值为5
关于无理数有下列说法①2个无理数之和可以是有理数②2个无理数之积可以是有理数③开方开不尽的数是无理数
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2
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4
下面4种说法①两个无理数的差一定是无理数②两个无理数的商一定是无理数③一个无理数与一个有理数的差仍是
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我们知道任意一个有理数与无理数的和为无理数任意一个不为零的有理数与一个无理数的积为无理数而零与无理数
若ab为实数则下面说法正确的是
a为无理数,a
2
一定是有理数
有理数与无理数的积一定是无理数
无理数与无理数的和一定还是无理数
若a为无理数,且(a+1)(b+1)=0,则b=﹣1
下列语句是真命题的是
x>1
若a>b,则a
2
>ab
y=sinx是奇函数吗?
若a﹣2是无理数,则a是无理数
下列说法正确的是.
无限小数是无理数
不循环小数是无理数
无理数的相反数还是无理数
两个无理数的和还是无理数
命题是无理数的否定是
不是无理数
不是无理数
不是无理数
不是无理数
已知函数fx为偶函数当x>0时fx=xlnx﹣x则曲线y=fx在点﹣ef﹣e处的切线方程为.
下列说法正确的是
无限小数是无理数
不循环小数是无理数
无理数的相反数还是无理数
两个无理数的和还是无理数
下列语句中正确的是
一个无理数与一个有理数的和一定是无理数
一个无理数与一个有理数的积一定是无理数
两个无理数的积一定是无理数
两个无理数的差一定是无理数
下列推理是否正确若不正确指出错误之处.1求证四边形的内角和等于360°.证明设四边形ABCD是矩形则
下列说法中正确的是
两个无理数的和还是无理数
两个不同有理数之间必定存在着无数个无理数
在1和2之间的有理数有无数个,但无理数却没有
如果
,则
是有理数
下列各数中是无理数的是
2
π
1.7323232…
设a是无理数b是有理数给出下面四个结论①a+b是无理数②a-b是无理数③ab是无理数④是无理数.其中
①②③④
①②③
①②
①③
下列全称命题为真命题的是
所有的素数是奇数
x∈R,x
2
+1≥1
对每一个无理数x,x
2
也是无理数
所有的平行向量均相等
下列六种说法正确的个数是无限小数都是无理;正数负数统称有理数;无理数的相反数还是无理数;无理数与无理
2个
3个
4个
5个
下列说法正确的是【】
无限不循环小数是无理数
带根号的数都是无理数
无限小数都是无理数
π是无理数,但
是分数,也就是有理数
下列命题既是全称命题又是真命题的个数是1对数函数都是单调函数2至少有一个整数它既是能被2整除又能被5
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已知在等式中abcd都是有理数x是无理数解答:1当abcd满足什么条件时s是有理数;2当abcd满足
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下列说法不正确的是
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有关下图所示化合物的说法不正确的是
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