问题
解答题
化简:
(1)a-(3a+b)+(a-5b)
(2)5abc-2a2b-[3abc-3(4ab2+a2b)].
答案
(1)原式=a-3a-b+a-5b=-a-6b;
(2)原式=5abc-2a2b-3abc+12ab2+3a2b=2abc+12ab2+a2b.
化简:
(1)a-(3a+b)+(a-5b)
(2)5abc-2a2b-[3abc-3(4ab2+a2b)].
(1)原式=a-3a-b+a-5b=-a-6b;
(2)原式=5abc-2a2b-3abc+12ab2+3a2b=2abc+12ab2+a2b.