题目内容
计算
(1) (
+
-
)×(-12);
(2)-22×(-
)+8÷(-2)2.
(1) (
| 5 |
| 12 |
| 2 |
| 3 |
| 3 |
| 4 |
(2)-22×(-
| 1 |
| 2 |
(1)(
+
-
)×(-12)
=
×(-12)+
×(-12)-
×(-12)
=-5-8+9
=-13+9
=-4;
(2)-22×(-
)+8÷(-2)2
=-4×(-
)+8÷4
=2+2
=4.
| 5 |
| 12 |
| 2 |
| 3 |
| 3 |
| 4 |
=
| 5 |
| 12 |
| 2 |
| 3 |
| 3 |
| 4 |
=-5-8+9
=-13+9
=-4;
(2)-22×(-
| 1 |
| 2 |
=-4×(-
| 1 |
| 2 |
=2+2
=4.
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