Question

因式分解两题

Answer 1

先做第二个吧
x5-x3+x2-1=x2(x3+1)-(x3+1=)=（x2-1）(x3+1）=（x+1）(x- 1)(x+1)(x2-x+1)=(x- 1(x2-x+1))(x+1)^2

追问

答案是这样吗

追答

不是 是（x+1）的平方 （x+1）^2

Answer 2

5、a²+b²+4a-4b-2ab+4
=(a-b)²+4(a-b)+4
=(a-b+2)²
6、原式=x³(x²-1)+x²-1
=(x³+1)(x²-1)
=(x+1)(x²-x+1)(x+1)(x-1)
=(x-1)(x+1)²(x²-x+1)