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用简便方法计算.25×1.25×3210÷[83-(513÷526+25)]54.2-29+4.8-1792.25×4.8+77.5×0.489511-(3.75+4511)7684×101-7684.
题目详情
用简便方法计算.
25×1.25×32 | 10÷[
| 54.2-
| ||||||||||||
2.25×4.8+77.5×0.48 | 9
| 7684×101-7684. |
▼优质解答
答案和解析
解;①25×1.25×32
=(25×4)×(1.25×8)
=100×10
=1000
②10÷[
-(
÷
+
)]
=10÷[
-2
]
=10×
=37.5
③54.2-
+4.8-1
=54.2+4.8-(
+1
)
=59-2
=57
④2.25×4.8+77.5×0.48
=2.25×4.8+7.75×4.8
=4.8×(2.25+7.75)
=4.8×10
=48
⑤9
-(3.75+4
)
=9
-4
-3.75
=5-3.75
=1.25
⑥7684×101-7684.
=7684×(101-1)
=7684×100
=768400
=(25×4)×(1.25×8)
=100×10
=1000
②10÷[
8 |
3 |
5 |
13 |
5 |
26 |
2 |
5 |
=10÷[
8 |
3 |
2 |
5 |
=10×
15 |
4 |
=37.5
③54.2-
2 |
9 |
7 |
9 |
=54.2+4.8-(
2 |
9 |
7 |
9 |
=59-2
=57
④2.25×4.8+77.5×0.48
=2.25×4.8+7.75×4.8
=4.8×(2.25+7.75)
=4.8×10
=48
⑤9
5 |
11 |
5 |
11 |
=9
5 |
11 |
5 |
11 |
=5-3.75
=1.25
⑥7684×101-7684.
=7684×(101-1)
=7684×100
=768400
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