问题 解答题
计算或化简
(1)23-17-(-7)+(-16)
(2)-14-(1-0.5)×
1
3
×[2-(-3)2]

(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×

1
3
×(2-9)

=-1-

1
6
×(-7)

=-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

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