x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
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x+y/2+x-y/6=52(x+y)-3(x-y)=-2x+y/2+x-y/6=52(x+y)-3(x-y)=-2x+y/2+x-y/6=52(x+y)-3(x-y)=-2由式（1）获得3X+3γ-
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
由式（1）获得
3X +3γ-4X +4 Y = 4
-X +7 Y = 4（3）
从（2）给
3倍3 Y + XY = 6
4X +2 Y = 6
∴2X + Y = 3（4）
（3）×2 +（4）为
15Y = 11
∴Y = 11/15
把Y = 11/15入（3）为
-X 77/15 = 6
X = 17/15
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
[2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
3x+5y-(x+y)=6 2(x+y)-3x=-7
2(x-y)=5y,x-y=-5
2(2x+3y)(3x+2y)-(6x-y)(2x-5y)
x-y / 5y= (y-x)^2 / ( )
[(2x-y)(2x+y)+y(y-6x)]÷2x=?
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51