9(x-y)^2-12(x-y)+4=
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知4x=9y求(1)x+y/y (2)y-x/2x
4(x+y)^2-12(x+y)(x-y)+9(+y)^2因式分解,
9y=3x-(x-1),4(x+y)-(2x+4)=8y
3y=2x y/3=x/2 12/x=9/y y/x=?y/x=?x/y=?
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
4-12(x-y)+9(x+y)^2
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
已知2x+y=4,求代数式[(x+y)2-(x-y)2-2y(x-12
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1