问题 解答题
计算
(1)(-3)×(-9)+8×(-5)
(2)(-0.5)-|-
1
4
|-(-2.75)+
1
2
答案

(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.

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