题目内容
计算
(1)-9+12-(-3)+8
(2)-14-(1-0.5)×
×[2-(-3)2].
(1)-9+12-(-3)+8
(2)-14-(1-0.5)×
1 |
3 |
(1)-9+12-(-3)+8
=-9+12+3+8
=-9+23
=14;
(2)-14-(1-0.5)×
×[2-(-3)2]
=-1-
×
×[2-9]
=-1-
×
×(-7)
=-1+
=
.
=-9+12+3+8
=-9+23
=14;
(2)-14-(1-0.5)×
1 |
3 |
=-1-
1 |
2 |
1 |
3 |
=-1-
1 |
2 |
1 |
3 |
=-1+
7 |
6 |
=
1 |
6 |
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