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