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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 02:46:10 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)38.7-7.84÷1.4
(5)5

12

-(1

12

-1

2

)
(6)8.8-2.5×1.8.

参考答案

(1)45+(38-14),
=45+(38-28),
=45+18,
=3240+540,
=3740;

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

(3)58-13+512,
=1524-824+1024,
=724+1024,
=1724;

(4)38.7-7.84÷1.4,
=38.7-5.6,
=33.1;

(5)512-(112-12),
=512-(112-612),
=512-(-512),
=512+512,
=1012,
=56;

(6)8.8-2.5×1.8,
=8.8-4.5,
=4.3.

考点: