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计算下面各题 能简算的要使用简便方法计算.(1)2319×112-1719÷12(2)87÷

2022-08-14 02:25:51 问答库 阅读 200 次

问题详情

计算下面各题,能简算的要使用简便方法计算.
(1)23

19

×1

12

-17

19

÷12
(2)87÷8

7

-7

8

+14×0.875
(3)32

5

-5

6

÷10

11

-13

12


(4)13

33

÷(20

33

+10

11

-1

3

)
(5)5

7

×(7

5

+14

15

)
(6)[3

4

÷3

4

+(3

5

÷9-1

15

)]×3

5

参考答案

(1)2319×112-1719÷12
=2319×112-1719×112
=(2319-1719)×112
=619×112
=138

(2)87÷87-78+14×0.875
=87×78-1×78+14×0.875,
=87×0.875-1×0.875+14×0.875,
=(87-1+14)×0.875,
=100×0.875,
=87.5;

(3)325-56÷1011-1312
=325-56×1110-1312
=325-1112-1312
=325-(1112+1312),
=325-2,
=125

(4)1333÷(2033+1011-13
=1333÷2033+3033-1133),
=1333÷3933
=1333×3339
=13

(5)57×(75+1415
=57×75+57×1415
=1+23
=123

(6)[34÷34+(35÷9-115)]×35
=[1+(35×19-115)]×35
=[1+(115-115)]×35
=[1+0]×35
=35

考点:方法