4+12(x-y)+9(x+y)²
x(x-y)-y(y-x)+(x-y)²因式分解
计算:(a-b)(x-y)-(b-a)(x+y) 4+12(x-y)+9(x-y)²
-{-[-(x-y)]}+{-[(x+Y)]}
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
{(x-y)²+(x+y)(x-y)}÷2x
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
计算 x+2y+﹙4y²/x-2y﹚+﹙4x²y/4y²-x²)
因式分解x²(x-2y)+y²(2y-x)
因式分解y²-9(x+y)² ,
x²+y²-4x+6y+13=0,求(3x+y)²-3(3x+y)(x+y)-(x-3y)
12x²-3y² (2x+y)²-(x+2y)²
计算:(4y分之3x²)² × 3x分之2y + 2y²分之x² ÷ x分之2y