问题
选择题
下列分解因式正确的是[ ]
A. x3 - x = x ( x2 - 1 )
B. m2 + m - 6 = ( m + 2 ) ( m-2 )
C. a2 - 16 = (a +4) (a -4)
D. x2 + y2= ( x + y) ( x - y)
答案
答案：C
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下列分解因式正确的是[ ]
A. x3 - x = x ( x2 - 1 )
B. m2 + m - 6 = ( m + 2 ) ( m-2 )
C. a2 - 16 = (a +4) (a -4)
D. x2 + y2= ( x + y) ( x - y)
答案：C