x+2y=6;x-2y=-2
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x+2y=6;x-2y=-2
![x+2y=6;x-2y=-2](/uploads/image/z/18818164-28-4.jpg?t=x%2B2y%3D6%3Bx-2y%3D-2)
x=2y=2
再问: 2x+3y=-7;3x+2y=7
再问: 过程
再问:![](http://img.wesiedu.com/upload/c/b4/cb4a6426d664d39c98e8146ba5a5c12d.jpg)
再答:![](http://img.wesiedu.com/upload/6/78/678b3c2409831c1743c00f2c8fe0ba71.jpg)
再问:![](http://img.wesiedu.com/upload/6/e1/6e14c3951c2aa673e6032bd4e996be5d.jpg)
再问: 2x+3y=-7;3x+2y=7
再问: 过程
再问:
![](http://img.wesiedu.com/upload/c/b4/cb4a6426d664d39c98e8146ba5a5c12d.jpg)
再答:
![](http://img.wesiedu.com/upload/6/78/678b3c2409831c1743c00f2c8fe0ba71.jpg)
再问:
![](http://img.wesiedu.com/upload/6/e1/6e14c3951c2aa673e6032bd4e996be5d.jpg)
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
y'-2y=(e^x)-x
y'+2y/x=x通解