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计算 能简算的要写出简算过程. 24×(138-312)45×38+56×37.5%-0.3

2022-08-14 02:55:56 问答库 阅读 200 次

问题详情

计算,能简算的要写出简算过程. 24×(13

8

-3

12

)45×3

8

+56×37.5%-0.375

[1-(1

4

+3

8

)]÷3

4

13

19

-3

13

+25

19

-10

13

3

8

×8÷3

5

×5

13

18

×(9

18

×17+9

18

)

参考答案

①24×(138-312),
=24×138-24×312,=39-6,
=33.②45×38+56×37.5%-0.375,
=45×0.375+56×0.375-0.375,
=0.375×(45+56-1),
=0.375×100,
=37.5;

③[1-(14+38)]÷34,
=[1-58]÷34,
=38×43,
=12;

④1319-313+2519-1013,
=1319+2519-313-1013,
=1319+2519-(313+1013),
=2-1,
=1;⑤38×8÷35×5,
=38×8×53×5,
=25;

⑥1318×(918×17+918),
=1318×[918×(17+1)],
=1318×[918×18],
=1318×9,
=132.

考点:过程