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计算下列各题(能简算的要简算)(23+215)×45        313×25+1013×

2022-08-14 02:19:24 问答库 阅读 200 次

问题详情

计算下列各题(能简算的要简算)
(2

3

+2

15

)×45        
3

13

×2

5

+10

13

×0.8-0.8
0.25×5

8

×4×1.6      
(11

2

+2.25)÷〔(31

3

-11

2

)÷12

9

参考答案

(1)(23+215)×45,
=23×45+215×45,
=30+6,
=36;

(2)313×25+1013×0.8-0.8,
=313×25+1013×2×25-2×25
=25×(313+2013-2),
=25×(-313),
=-665

(3)0.25×58×4×1.6,
=(0.25×4)×(58×1.6),
=1×1,
=1;

(4)(112+2.25)÷[(313-112)÷129],
=(1.5+2.25)÷[116×911],
=3.75÷32
=3.75×23
=2.5.

考点: