Question

因式分解：1.a²（b-1)+(1-b) 2. 2x²y-x三次方-xy²3.x²

Answer 1

1.原式=(a²-1)(b-1)=(a+1)(a-1)(b-1)

2.原式=-x(x²-2xy+y²)=-x(x-y)²

3.原式=(x-3y)(x+y)

4.原式=-2(a²-2a+1)=-2(a-1)²