题目内容
计算
(1)(-3)×(-9)+8×(-5)
(2)(-0.5)-|-
|-(-2.75)+
.
(1)(-3)×(-9)+8×(-5)
(2)(-0.5)-|-
| 1 |
| 4 |
| 1 |
| 2 |
(1)原式=27-40
=-13;
(2)原式=(-0.5)-0.25+2.75+0.5
=[(-0.5)+0.5]-(0.25-2.75)
=2.
=-13;
(2)原式=(-0.5)-0.25+2.75+0.5
=[(-0.5)+0.5]-(0.25-2.75)
=2.
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