问题
解答题
化简:
(1)2a-5b-3a+b;
(2)2x+(5x-3y)-2(3x+y);
(3)5ab2-3[2a2b-2(a2b-2ab2)]
答案
(1)原式=-a-4b;
(2)原式=2x+5x-3y-6x-2y
=x-5y;
(3)原式=5ab2-3[2a2b-2a2b+4ab2]
=5ab2-6a2b+6a2b-12ab2
=-7ab2.
化简:
(1)2a-5b-3a+b;
(2)2x+(5x-3y)-2(3x+y);
(3)5ab2-3[2a2b-2(a2b-2ab2)]
(1)原式=-a-4b;
(2)原式=2x+5x-3y-6x-2y
=x-5y;
(3)原式=5ab2-3[2a2b-2a2b+4ab2]
=5ab2-6a2b+6a2b-12ab2
=-7ab2.