问题
解答题
化简:
(1)-7mn+mn+5nm
(2)3a2b-4ab2-4+5a2b+2ab2+7.
答案
(1)原式=(-7+1+5)mn=-mn;
(2)原式=(3+5)a2b+(-4+2)ab2+7-4
=8a2b-2ab2+3.
化简:
(1)-7mn+mn+5nm
(2)3a2b-4ab2-4+5a2b+2ab2+7.
(1)原式=(-7+1+5)mn=-mn;
(2)原式=(3+5)a2b+(-4+2)ab2+7-4
=8a2b-2ab2+3.