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用你喜欢的方法计算下面各题.15+56+23        718-(518-19)    

2022-08-14 02:30:44 问答库 阅读 200 次

问题详情

用你喜欢的方法计算下面各题.
1

5

+5

6

+2

3

        7

18

-(5

18

-1

9

)    5

24

+1

4

+2

3


3

4

+4

9

+1

4

+2

9

       2-2

7

-3

7

     3

8

+2

7

+1

8

+5

7

参考答案

(1)15+56+23,
=15+(56+23),
=15+32,
=1710;

(2)718-(518-19),
=718-518+19,
=19+19,
=29;

(3)524+14+23,
=1124+1624,
=98;

(4)34+49+14+29,
=(34+14)+(29+49),
=1+23,
=123;

(5)2-27-37,
=2-(27+37),
=2-57,
=127;

(6)38+27+18+57,
=(38+18)+(27+57),
=12+1,
=112.

考点:方法