问题
解答题
把下列各式分解因式. (1)(m+n)3+2m(m+n)2+m2(m+n); (2)(a2+b2)2-4a2b2 (3)(m2-m)2+
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答案
(1)(m+n)3+2m(m+n)2+m2(m+n)
=(m+n)[(m+n)2+2m(m+n)+m2]
=(m+n)(2m+n)2;
(2)(a2+b2)2-4a2b2
=(a2+b2)2-(2ab)2
=(a2+b2+2ab)(a2+b2-2ab)
=(a+b)2(a-b)2;
(3)(m2-m)2+
(m2-m)+1 2 1 16
=(m2-m+
)21 4
=(m-
)4.1 2