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正确 合理 灵活地计算.86×485 219-(713-1719)-6135÷[(23+15

2022-08-14 02:52:17 问答库 阅读 200 次

问题详情

正确、合理、灵活地计算.
86×4

85

 

2

19

-(7

13

-17

19

)-6

13

5÷[(2

3

+1

5

)×1

13

]

9

32

÷[4

3

×(1

3

+1

4

-1

24

-1

4

)]

5

21

×8

13

+5

13

×5

21

-5

21

参考答案

(1)86×485
=(85+1)×485
=85×485+485
=4+485
=4485;

(2)219-(713-1719)-613
=219-713+1719-613
=(219+1719)-(713+613)
=1-1
=0;

(3)5÷[(23+15)×113]
=5÷[1315×113]
=5÷115
=5×15
=75;

(4)932÷[43×(13+14-124-14)]
=932÷[43×(14-14+13-124)]
=932÷[43×724]
=932÷718
=932×187
=81112;

(5)521×813+513×521-521
=521×(813+513-1)
=521×0
=0.

考点: