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脱式计算 怎样简便就怎样算①(12-14)÷13+16②34÷910-514×715③89×

2022-08-14 02:21:01 问答库 阅读 200 次

问题详情

脱式计算,怎样简便就怎样算
(1

2

-1

4

)÷1

3

+1

6


3

4

÷9

10

-5

14

×7

15


8

9

×[3

4

-(7

16

-1

4

)]

④102×98

101


4

5

-5

9

+1

5

-4

9


8

13

÷7+1

7

×5

13

参考答案

①(12-14)÷13+16
=14×3+16
=912+212
=1112

34÷910-514×715
=34×109-514×715
=56-16
=23

89×[34-(716-14)]
=89×[34-316],
=89×916
=12

④102×98101
=(101+1)×98101
=101×98101+1×98101
=98+98101
=9898101

45-59+15-49
=(45+15)-(59+49),
=1-1,
=0;

813÷7+17×513
=813×17+17×513
=17×513+813),
=17×1
=17

考点: