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脱式计算.(能简算的要简算)12.3+5.6×1.4÷0.32(56+14)÷(23-59)90×(745+1115-59)3.6×[2÷(45-0.6)]18.5×2.71+7.29×(30-11.5)

题目详情
脱式计算.(能简算的要简算)
12.3+5.6×1.4÷0.32             
5
6
+
1
4
)÷(
2
3
-
5
9

90×(
7
45
+
11
15
-
5
9
)              
3.6×[2÷(
4
5
-0.6)]
18.5×2.71+7.29×(30-11.5)
▼优质解答
答案和解析
(1)12.3+5.6×1.4÷0.32
=12.3+7.84÷0.32
=12.3+24.5
=36.8;

(2)(
5
6
+
1
4
)÷(
2
3
-
5
9

=
13
12
÷
1
9

=
39
4


(3)90×(
7
45
+
11
15
-
5
9

=90×
7
45
+90×
11
15
-90×
5
9

=14+66-50
=80-50
=30;

(4)3.6×[2÷(
4
5
-0.6)]
=3.6×[2÷0.2]
=3.6×10
=36;

(5)18.5×2.71+7.29×(30-11.5)
=18.5×2.71+7.29×18.5
=18.5×(2.71+7.29)
=18.5×10
=185.