stepwise(x,z)-搜答案-搜搜做题作业网

(x+y-z)(x-y+z)=

[x+(z-y)][x-(z-y)]=x-(z-y)记得采纳啊

∑是循环和例如∑a=a+b+c∑a^2=a^2+b^2+c^2∑(z-y)(x-y)/(x+y-2z)(y+z-2x)＝∑(z-y)(x-y)(x+z-2y)/(x+y-2z)(y+z-2x)(x+z

Hwnd=Plugin.Window.GetKeyFocusWnd()Delay2000t1=now:t2=now:sj1=0.5:sj2=60RemabccDelay20IfDateDiff("s"

3或-1

(1)原式=x+y+z)(-x+y+z)(x-y+z)(x+y-z)=[(x+y+z)(x+y-z)]*{[z+(x-y)][z-(x-y)]}=[(x+y)^2-z^2][z^2-(x-y)^2]=

(x+y-z)(x-y+z)-(y+z-x)(z-x-y)=(x+y-z)(x-y+z)+(y+z-x)(x+y-z)所以公因式是(x+y-z)

∵x-2y+z=（x-y）-（y-z）,x+y-2z=（y-z）-（z-x）,y+z-2x=（z-x）-（x-y）．设x-y=a,y-z=b,z-x=c,则原式=-ac/(a-b)(b-c)+(-ba

正整数?取对数即证：2xlnx+2ylny+2zlnz>(y+z)lnx+(x+z)lny+(x+y)lnzx>y>z,lnx>lny>lnz由排序不等式得xlnx+ylny+zlnz>ylnx+zl

方向 X Y Z

X--水平横向方向；Y--水平竖向方向；Z--垂直竖向方向.

matlab文件名和函数名要一致,包括大小写clear是清变量,clc只清屏,clf清除图形窗口上的旧图形holdon是为了显示多幅图像时,防止新的窗口替代旧的窗口plot的功能,可以在matlab命

(y+z-2z)这步有错吧

matlab没有stepwise

很简单,可能是你的matlab不是完整版,被人“阉割”了,下载一个统计学的工具包就ok了,然后粘贴到toolbox下面,之后setpath一下链接一下就ok了~我可以给你这个工具包~

z=x

三元运算符我加个括号你就明白了z=x

matlab stepwise

intercept截距是回归方程的常数项R-square是回归模型的判定系数,即拟合度,其等于1为完全拟合F是显著性检验的统计量,其大于Fa（查表得）说明回归方程是显著的残差均方RMSE（这个值越小越

(x+y+z)^5-(x+y-z)^5-(x+z-y)^5-(z+y-x)^5=80xyz(x^2+y^2+z^2)注:x^5,y^5,z^5之类的是被消掉了.我的结果100%是正确的,你再算算吧.朝

X+Y+Z=?

X+Y+Z

第二个分母写错了?(y-x)(z-x)/(x-2y+z)/(x+y-2z)+(z-y)(x-y)/(x+y-2z)/(y+z-2x)+(x-z)(y-z)/(y+z-2x)/(x-2y+z)=1

f=x+1f+u=2x+3f+u+c=3x+8f+u+c+k=4x+15f(f,u,c,k)=(x+1)(2x+3)(3x+8)(4x+15)

应用平方差公式a^2-b^2=(a+b)(a-b)(x+y+z)(x+y-z)(x-y+z)(-x+y+z)=[(x+y)^2-z^2][z^2-(x-y)^2]=-z^4+[(x+y)^2+(x-y

（x+y+z)(-x+y+z)(x-y+z)(x+y-z)=-[(x+y+z)(x+y-z)][(x-y+z)(x-y-z)]=-[(x+y)²-z²]*[(x-y)²-