线性规划x y分之x-y怎么划
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/02 18:28:07
这个已经是最简了,要么就是把分母因式分解一下.(x²+y²)/(2x²+2xy)=(x²+y²)/[2x(x+y)]
答案是零,左边约分剩下x/y
x/y+y/x就是斜率+1/斜率具体的求要用到双钩函数没错啊,就是化简一下=(x^2+Y^2)/xy=x/y+y/x
绝对算不出来再答:如果是一道题发图咯再问:x平方减xy加y平方分之x平方加2xy加y平方他给你条件是y分之x等于2分之1xy再问:吧xy无视掉再答:马上再答:化成Y等于2X在带入再问:然后怎么样再答:
=xy(x-y)×[-xy/(x-y)]=-(xy)²=-x²y²
=(xy-x的平方)除以(x的平方-2xy+y的平方\xy)乘以(x-y\x的平方)=-x(x-y)×xy/(x-y)2×(x-y)/x2=-y再问:嗯
可以先设xy=t原式=[4(t-1)^2-(t+2)(2-t)]/(1/4*t)=4(4t^2-8t+4-2t+t^2-4+2t)/t=4(5t^2-8t)/t=(20t-32)/t=20-32/t将
xy/(x+y)=2∴xy=2(x+y)(3xy-x-y)/(3x-5xy+3y)=[6(x+y)-x-y]/[3x+3y-10(x+y)]=5(x+y)/[-7(x+y)]=-5/7
因为X+Y分之XY=2,所以XY=2(X+Y)代入后面的分子式得:13(X+Y)/5(X+Y)=13/5
1除以(1-根号下xy)
原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)
1、(xy分之x²-y²)×(x-y分之x)-(y分之x);=(x+y)(x-y)/xy×x/(x-y)-x/y=(x+y)/y-x/y=(x+y-x)/y=12、6xy²
(xy-x²)乘(x-y)分之xy=-x(x-y)乘[(x-y)分之xy]=-x²y
xy/(x+y)=2(x+y)/xy=1/21/x+1/y=1/2(3x-xy+3y)/(-x+3xy-y)=(3/y-1+3/x)/(-1/y+3-1/x)=[3(1/x+1/y)-1]/[(3-(
设x+y=axy=b,则b/a=3b=3a所以-X+3XY-Y分之2X-3XY+2Y可以写成(2a-3b)/(3b-a)=-7/8
(xy-x²)÷xy分之x²-2xy+y²乘x²分之x-y=-x(x-y)×xy/(x-y)²×(x-y)/x²=-y∴结果与x的值没有关系
干什么?计算吗?原式=x/y(x²-y²)/(xy)-(xy-y²)/(xy-x²)=(x²-y²)/(xy)-y(x-y)/[x(y-x)
分子上应写:(x-1)²或者x²-2x+1再问:怎么书面表达呢?能否详细一些,谢谢再答:希望你及时采纳!!!!!
公分母是2(x+y)^2(x-y)/(2x+2y)=(x-y)*(x+y)/2(x+y)*(x+y)=(x^2-y^2)/2(x+y)^2xy/(x+y)^2=2xy/2(x+y)^2