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计算各题 能简便运算的要写出简算过程.[1-(14+38)]÷1436×(14+16+19)

2022-08-14 02:40:58 问答库 阅读 200 次

问题详情

计算各题,能简便运算的要写出简算过程.
[1-(1

4

+3

8

)]÷1

4


36×(1

4

+1

6

+1

9

)
85×3

86

=3

5

×17+13×3

5

=
(1

3

+1

4

-1

24

)×244

9

÷[5

6

-(1

3

-1

6

)].

参考答案

(1)[1-(14+38)]÷14
=[1-58]÷14
=38÷14
=1.5;

(2)36×(14+16+19)
=36×14+36×16+36×19
=9+6+4
=19;

(3)85×386
=86×386-1×386
=3-386
=28386;

(4)35×17+13×35
=(17+13)×35
=30×35
=18;

(5)(13+14-124)×24
=13×24+14×24-124×24
=8+6-1
=13;

(6)49÷[56-(13-16)]
=49÷[56+16-13]
=49÷[1-13]
=49÷23
=23.

考点:过程