题目内容
计算
(1)12-7+18-15
(2)(1-
)÷(-1
)+(-2)2×(-3).
(1)12-7+18-15
(2)(1-
| 2 |
| 3 |
| 1 |
| 6 |
(1)12-7+18-15
=30-22
=8;
(2)(1-
)÷(-1
)+(-2)2×(-3)
=
÷(-1
)+4×(-3)
=-
-12
=-12
.
=30-22
=8;
(2)(1-
| 2 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 3 |
| 1 |
| 6 |
=-
| 2 |
| 7 |
=-12
| 2 |
| 7 |
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