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脱式计算.能简便的别忘了简算哟!642+240÷16450÷20+1.9×433.5×[(4.8-0.3)×4]74-(38+512)17×813+513÷7110÷[28×(78-37)]
题目详情
脱式计算.能简便的别忘了简算哟!
642+240÷16 | 450÷20+1.9×43 | 3.5×[(4.8-0.3)×4] | ||||||||||||||||
|
| 110÷[28×(
|
▼优质解答
答案和解析
(1)642+240÷16
=642+15
=657
(2)450÷20+1.9×43
=22.5+81.7
=104.2
(3)3.5×[(4.8-0.3)×4]
=3.5×[4.5×4]
=3.5×18
=63
(4)
-(
+
)
=
-(
+
)
=
-
=
(5)
×
+
÷7
=
×
+
×
=
×(
+
)
=
×1
=
(6)110÷[28×(
-
)]
=110÷[28×
]
=110÷
=8.8
=642+15
=657
(2)450÷20+1.9×43
=22.5+81.7
=104.2
(3)3.5×[(4.8-0.3)×4]
=3.5×[4.5×4]
=3.5×18
=63
(4)
7 |
4 |
3 |
8 |
5 |
12 |
=
42 |
24 |
9 |
24 |
10 |
24 |
=
42 |
24 |
19 |
24 |
=
23 |
24 |
(5)
1 |
7 |
8 |
13 |
5 |
13 |
=
1 |
7 |
8 |
13 |
5 |
13 |
1 |
7 |
=
1 |
7 |
8 |
13 |
5 |
13 |
=
1 |
7 |
=
1 |
7 |
(6)110÷[28×(
7 |
8 |
3 |
7 |
=110÷[28×
25 |
56 |
=110÷
25 |
2 |
=8.8
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