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计算下列各题 能简算的要简算. (1)45+(38-14)(2)2-37-47(3)58-1

2022-08-14 00:45:04 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)4

5

+(3

8

-1

4

)(2)2-3

7

-4

7

(3)5

8

-1

3

+5

12

(4)2

9

+9

17

+7

9

+8

17

(5)5

12

-(1

2

-1

12

)(6)4

5

-(7

15

-4

9

)

参考答案


(1)45+(38-14),
=45+18
=3740

(2)2-37-47
=2-(37+47),
=2-1,
=1;

(3)58-13+512
=724+512
=1724

(4)29+917+79+817
=(29+79)+(917+817),
=1+1,
=2;

(5)512-(12-112),
=512-12+112
=512+112-12
=12-12
=0;

(6)45-(715-49),
=45-715+49
=13+49
=79

考点: