已知-1/2<=x<=1,[x^(-2)]※[(-x^2)十1]^(1/2)的e x 2定积分分是?

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解:F(x)=(1-x)/(1+x)
由1+x≠0,得函数F(x)的定义域为:{x∣x∈R,且x≠-1}
由y=(1-x)/(1+x)
...
已知函数f(x)=2^x-(1/2^|x|)
(1)若f(x)=2,求x的值;
①当x≥0时,f(x)=2^x-(1/2^x)=2
解:原式=cosx-1+(cosx)^2-2(cosx)^2+1,
整理一下并配方得到:-(cosx-1/2)^2+1/4,
它小于等于2当且仅当cosx=...
设A在6个圆的内部,设Oi为第i个圆心,且Oi绕A逆时针排列,
ri为第i个圆的半径,si为|AOi|,再设O7=O1。
显然三角形AOiO(i+1)的最长...
y=(1/cosx )-2sinx, 当x∈(2kπ-π/2,2kπ+π/2)时,1/cosx≥1,仅当x=2kπ时取“=”, 此时-2sinx≥0,∴ y≥0...
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I received this error message:
Error in if (condition) { : missing value where TRUE/FALSE needed
Error in while (condition) { : missing value where TRUE/FALSE needed
What does it mean, and how do I prevent it?
59.3k17131244
1,62672950
The evaluation of condition resulted in an NA.
The if conditional must have either a TRUE or FALSE result.
if (NA) {}
## Error in if (NA) { : missing value where TRUE/FALSE needed
This can happen accidentally as the results of calculations:
if(TRUE && sqrt(-1)) {}
## Error in if (TRUE && sqrt(-1)) { : missing value where TRUE/FALSE needed
To test whether an object is missing use
rather than x == NA.
See also the related errors:
if (NULL) {}
## Error in if (NULL) { : argument is of length zero
if ("not logical") {}
## Error: argument is not interpretable as logical
if (c(TRUE, FALSE)) {}
## Warning message:
## the condition has length & 1 and only the first element will be used
59.3k17131244
34.2k787130
Eliminates the space between the operands and operators.
Instead of: (comments[l] != NA)
Write: (comments[l]!=NA)
6,175102235
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Stack Overflow works best with JavaScript enabled不等式1&|x+1|&3的解集为
A.(0,2)B.(-2,0)∪(2,4)C.(-4,0)D.(-4,-2)∪(0,2)
试题“不等式1&|x+1|&3的解集为...”;主要考察你对
等知识点的理解。
若2,3,x, 5,这四个数的平均数是4,则x=(
有3张不透明的卡片,除正面写有不同的实数外,其它均相同.将这三张卡片背面朝上洗匀后.第一次从中随机抽取一张,并把这张卡片上标有的实数记作第一个加数,第二次从余下的两张卡片中再随机抽取一张,上面标有的实数记作第二个加数.(1)写出第一次随机抽取的卡片上的实数与
是同类二次根式的概率;(2)请你用画树状图或列表等方法,求出这两个加数可以合并的概率.
下列说法“①任意两个正方形必相似;②如果两个相似三角形对应高的比为4:5,那么它们的面积比为4:5;③抛物线y=-(x-1)2+3对称轴是直线x=1,当x<1时,y随x的增大而增大;④若
;⑤一元二次方程x2-x=4的一次项系数是-1;⑥
不是同类二次根式”中,正确的个数有(  )个
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