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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
+
×(2
-1
);
6.15÷2
-
×(
+4.36);
0.8×(0.7-0.175)+9.278÷3.2;
[2.1+7÷(3
-1
).
56×125-4228÷7;
7
3 |
4 |
5 |
8 |
3 |
4 |
3 |
20 |
6.15÷2
1 |
2 |
1 |
3 |
1 |
20 |
0.8×(0.7-0.175)+9.278÷3.2;
[2.1+7÷(3
1 |
12 |
5 |
8 |
▼优质解答
答案和解析
(1)56×125-4228÷7
=7000-604
=6396;
(2)7
+
×(2
-1
)
=7
+
×
=7
+1
=8
;
(3)6.15÷2
-
×(
+4.36)
=2.46-
×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
)
=2.1+7×
=2.1+4.8
=6.9.
=7000-604
=6396;
(2)7
3 |
4 |
5 |
8 |
3 |
4 |
3 |
20 |
=7
3 |
4 |
5 |
8 |
8 |
5 |
=7
3 |
4 |
=8
3 |
4 |
(3)6.15÷2
1 |
2 |
1 |
3 |
1 |
20 |
=2.46-
1 |
3 |
=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 |
5 |
8 |
=2.1+7×
24 |
35 |
=2.1+4.8
=6.9.
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