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能简算的用简便方法计算.(25-25÷2)×531516-(712+16)×12204÷19

2022-08-14 02:51:55 问答库 阅读 200 次

问题详情

能简算的用简便方法计算.
(2

5

-2

5

÷2)×5

3

15

16

-(7

12

+1

6

)×1

2

204÷1

91

+204×9

1

2

×3.2+5.6×0.5+1.2×50%[5

3

-(2

5

+3

4

)]÷31

4

99×97

98

参考答案

(1)(25-25÷2)×53
=(25-15)×53
=15×53
=13;

(2)1516-(712+16)×12
=1516-34×12
=1516-38
=916;

(3)204÷191+204×9
=204×91+204×9
=204×(91+9)
=204×100
=20400;

(4)12×3.2+5.6×0.5+1.2×50%
=0.5×3.2+5.6×0.5+1.2×0.5
=0.5×(3.2+5.6+1.2)
=0.5×10
=5;

(5)[53-(25+34)]÷314
=[53-2320]÷314
=3160÷314
=115;

(6)99×9798
=(98+1)×9798
=98×9798+1×9798
=97+9798
=979798.

考点:方法