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计算下列各题 能简算的要简算.(1)25+13+35(2)34-15-38(3)79+15-

2022-08-14 00:49:37 问答库 阅读 200 次

问题详情

计算下列各题,能简算的要简算.
(1)2

5

+1

3

+3

5

(2)3

4

-1

5

-3

8

(3)7

9

+1

5

-(1

5

+5

9

)

(4)2

3

+(1

2

-1

4

)
(5)1-8

17

-9

17

(6)3

11

+7

18

+8

11

-1

18

参考答案

(1)25+13+35
=(25+35)+13
=1+13
=113

(2)34-15-38
=3040-840-1540
=2240-1540
=740

(3)79+15-(15+59),
=79+15-15-59
=(79-59)+(15-15),
=29+0,
=29

(4)23+(12-14),
=23+(24-14),
=23+14
=812+312
=1112

(5)1-817-917
=1-(817+917),
=1-1,
=0;

(6)311+718+811-118
=(311+811)+(718-118),
=1+13
=113

考点: