问题
选择题
分解因式x4-1的结果为( )
A.(x2-1)(x2+1)
B.(x+1)2(x-1)2
C.(x-1)(x+1)(x2+1)
D.(x-1)(x+1)3
答案
x4-1=(x2-1)(x2+1)=(x+1)(x-1)(x2+1).
故选C
分解因式x4-1的结果为( )
A.(x2-1)(x2+1)
B.(x+1)2(x-1)2
C.(x-1)(x+1)(x2+1)
D.(x-1)(x+1)3
x4-1=(x2-1)(x2+1)=(x+1)(x-1)(x2+1).
故选C