问题
选择题
将xm+3-xm+1分解因式,结果是( )
A.xm(x3-x)
B.xm(x3-1)
C.xm+1(x2-1)
D.xm+1(x-1)(x+1)
答案
xm+3-xm+1,
=xm+1•x2-xm+1,
=xm+1(x2-1),
=xm+1(x+1)(x-1).
故选D.
将xm+3-xm+1分解因式,结果是( )
A.xm(x3-x)
B.xm(x3-1)
C.xm+1(x2-1)
D.xm+1(x-1)(x+1)
xm+3-xm+1,
=xm+1•x2-xm+1,
=xm+1(x2-1),
=xm+1(x+1)(x-1).
故选D.