问题
解答题
计算或化简 (1)23-17-(-7)+(-16) (2)-14-(1-0.5)×
(3)a2-2a-4a2+a (4)(3a2b-ab2)-4(-ab2+3a2b) |
答案
(1)原式=23-17+7-16
=-3;
(2)原式=-1-0.5×
×(2-9)1 3
=-1-
×(-7)1 6
=-1+7 6
=
;1 6
(3)原式=(1-4)a2-(2-1)a
=-3a2-a;
(4)原式=3a2b-ab2+4ab2-12a2b
=(3-12)a2b-(1-4)ab2
=-9a2b+3ab2.