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脱式计算(能简算的要简算)(1)1.8×2.58+0.5+1.42×1.8(2)(54.7-17.5)×(0.45÷0.9)(3)52.91-311113-18213(4)15-8811+212.

题目详情
脱式计算(能简算的要简算)
(1)1.8×2.58+0.5+1.42×1.8
(2)(54.7-17.5)×(0.45÷0.9)
(3)52.91-31
11
13
-18
2
13

(4)15-8
8
11
+2
1
2
▼优质解答
答案和解析
(1)1.8×2.58+0.5+1.42×1.8
=1.8×(2.58+0.5+1.42)
=1.8×4.5
=8.1

(2)(54.7-17.5)×(0.45÷0.9)
=37.2×0.5
=18.6

(3)52.91-31
11
13
-18
2
13

=52.91-(31
11
13
+18
2
13

=52.91-50
=2.91

(4)15-8
8
11
+2
1
2

=(15-8+2)-(
8
11
-
1
2

=9-
5
22

=8
17
22