a^3b-ab^3
=ab(a²-b²)
=ab(a+b)(a-b)
如果本题有什么不明白可以追问,因式分解 -ab+2a^2 b-a^3b解方程 x/x-2+2/x^2-4=1因式分解 -ab+2a^2 b-a^3b=-ab(1-2a+a²)=-ab(a-1)²;解方程 x/x-2+2/x^2-4=1(x(x+2)+2)/(x²-4)=1;x²+2x+2=x³-4;2x=-6;x=-3;[2x^-(x+y)(x-y)][(-x-y)(-x+y)+2y^2] (4x^2-y^2)/4x-4xy+y^2/2x-y*2x-y/2x-y,其中，x=1/2，y=-1[2x^-(x+y)(x-y)][(-x-y)(-x+y)+2y^2] (4x^2-y^2)/4x-4xy+y^2/2x-y*2x-y/2x-y,其中，x=1/2，y=-1题目有歧义，？