5x-9y=2 x-2y=5
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4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
5x=3y,(2x+y)的平方=5x(x+y)+9
3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
2(x-y)=5y,x-y=-5
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
x-y / 5y= (y-x)^2 / ( )
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
x*x+2x+y*y-4y+5=0 x= y=
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
{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
求(X+Y)(X-Y)(X²+Y²),X=5 Y=2,
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5