题目内容
化简
(1)4(m2+n)+2(n-2m2);
(2)5ab2-[a2b+2(a2b-3ab2)].
(1)4(m2+n)+2(n-2m2);
(2)5ab2-[a2b+2(a2b-3ab2)].
(1)原式=4m2+4n+2n-4m2
=6n;
(2)原式=5ab2-[a2b+2a2b-6ab2]
=5ab2-a2b-2a2b+6ab2
=11ab2-3a2b.
=6n;
(2)原式=5ab2-[a2b+2a2b-6ab2]
=5ab2-a2b-2a2b+6ab2
=11ab2-3a2b.
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