问题 解答题
计算
(1)-9+12-(-3)+8
(2)-14-(1-0.5)×
1
3
×[2-(-3)2]
答案

(1)-9+12-(-3)+8

=-9+12+3+8

=-9+23

=14;

(2)-14-(1-0.5)×

1
3
×[2-(-3)2]

=-1-

1
2
×
1
3
×[2-9]

=-1-

1
2
×
1
3
×(-7)

=-1+

7
6

=

1
6

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