A-A+

用你喜欢的方法计算下面各题.14+38-1234-56+14910-58-1858-(12-

2022-08-14 00:35:49 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

4

+3

8

-1

2

3

4

-5

6

+1

4

9

10

-5

8

-1

8

5

8

-(1

2

-1

4

)

2

3

+3

11

-2

3

1

3

+4

7

+2

3

+1

7

5

6

+(1

6

-1

5

)23

25

-2

9

+2

25

-5

9

参考答案

(1)14+38-12
=28+38-48
=18

(2)34-56+14
=34+14-56
=1-56
=16

(3)910-58-18
=910-(58+18),
=910-34
=1820-1520
=320

(4)58-(12-14),
=58-14
=38

(5)23+311-23
=23-23+311
=311

(6)13+47+23+17
=(13+23)+(47+17),
=1+57
=157

(7)56+(16-15),
=56+16-15
=1-15
=45

(8)2325-29+225-59
=(2325+225)-(29+59),
=1-1,
=0.

考点:方法