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脱式计算:(写出主要过程)56×125-4228÷7;734+58×(234-1320);6.15÷212-13×(120+4.36);0.8×(0.7-0.175)+9.278÷3.2;[2.1+7÷(3112-158).

题目详情
脱式计算:(写出主要过程)
56×125-4228÷7;  
7
3
4
+
5
8
×(2
3
4
-1
3
20
);  
6.15÷2
1
2
-
1
3
×(
1
20
+4.36);
0.8×(0.7-0.175)+9.278÷3.2;
[2.1+7÷(3
1
12
-1
5
8
).
▼优质解答
答案和解析
(1)56×125-4228÷7
=7000-604
=6396;

(2)7
3
4
+
5
8
×(2
3
4
-1
3
20

=7
3
4
+
5
8
×
8
5

=7
3
4
+1
=8
3
4
;  

(3)6.15÷2
1
2
-
1
3
×(
1
20
+4.36)
=2.46-
1
3
×4.41
=2.46-1.47
=0.99;

(4)0.8×(0.7-0.175)+9.278÷3.2
=0.8×0.525+2.899375
=0.42+2.899375
=3.319375;

(5)2.1+7÷(3
1
12
-1
5
8

=2.1+7×
24
35

=2.1+4.8
=6.9.