计算.25(x+y)^2-0.81(x-y)^20.25(x+y)^2-0.81(x-y)^2 .

计算.25(x+y)^2-0.81(x-y)^20.25(x+y)^2-0.81(x-y)^2 . 计算2x/x-y 因式分解计算4(x+y)^2-20(x+y)+25 计算（x+y）^2+10（y-x）+25 计算:(x+2y)(2x-y) 计算:(x+3y)(2x-y) 计算:(2x-3y)(x+y) 计算:(-x-2y) * (3x-y) 计算：(x+y)-3(x-2y). 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 计算:y-x分之x+y+x-y分之y-y-x分之2x-y 计算:(x-y)^2*(y-x)^2*(x-y)^6 计算(x-y)(y^2-x^2)(-x-y) 计算(x+y)(x+y)^2(-x-y)^3 3x(x-y)+2y(x-y) 计算 计算：（x-y）^2-(x+y)(x-y) （x-2y）(x+y)+（x+y）计算 计算[2x^2-(x+y)(x-y)][(-x-y)(y-x)+2y^2]