2x-7y=8y-2x=32
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
x+2y=2x+y+1=7x-y 求:2x-y?
12y(x-y)^2-8(x-y)^3=?
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
x^2+y^2=15,x+y=7,x>y,求x-y
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
当x+y=2时7(x+y)一(x+y)+(x+y)=?
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
2x-y=7,3x+y=8
(x+2y)(x-2y)-(2y-x)(-2x-y)其中x=8,y=-8
(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5
[(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x=
已知X*X+Y*Y+6X-8Y+25=0 求(Y/X)+(X/Y)-2=?
x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值
已知{2x+y=7,x+2y=8,则x-y=?x+y=?