问题
解答题
计算: (1)(+3.5)-1.4-(+2.5)+(-4.6); (2)-81÷2
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答案
(1)原式=3.5-1.4-2.5-4.6=1-6=-5;
(2)原式=-81×
-4 9
×9 4
=-36-1 16
=-369 64
.9 64
计算: (1)(+3.5)-1.4-(+2.5)+(-4.6); (2)-81÷2
|
(1)原式=3.5-1.4-2.5-4.6=1-6=-5;
(2)原式=-81×
-4 9
×9 4
=-36-1 16
=-369 64
.9 64