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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÷[
8
3
-(
5
13
÷
5
26
+
2
5
)]
54.2-
2
9
+4.8-1
7
9
 
2.25×4.8+77.5×0.48 9
5
11
-(3.75+4
5
11
)         
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÷[
8
3
-(
5
13
÷
5
26
+
2
5
)]
=10÷[
8
3
-2
2
5
]
=10×
15
4

=37.5

③54.2-
2
9
+4.8-1
7
9
 
=54.2+4.8-(
2
9
+1
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
-(3.75+4
5
11

=9
5
11
-4
5
11
-3.75
=5-3.75
=1.25

⑥7684×101-7684.
=7684×(101-1)
=7684×100
=768400