4+12(x-y)+9(x-y)^
4(x+y)^2-12(x+y)(x-y)+9(+y)^2因式分解,
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
4-12(x-y)+9(x+y)^2
因式分解4-12(x-y)+9(x-y)的平方
4+12(x-y)+9(x-y)的平方
分解因式:9(x-y)*2+12(x*2-y*2)+4(x+y)*2
已知4x=9y求(1)x+y/y (2)y-x/2x
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
计算 [12(x+y)³(y-x)]³÷[4(x+y)²(x-y)]²
x(x-y)+4(y-x)因式分解
{(x,y) |x|+|y|
x>y?x:y