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简便方法计算 写出主要计算过程.(1)6.12+37+2.88+47(2)2924-(524

2022-08-14 00:32:41 问答库 阅读 200 次

问题详情

简便方法计算,写出主要计算过程.
(1)6.12+3

7

+2.88+4

7

(2)29

24

-(5

24

-4

9

)(3)18

11

-(7

11

+3

8

)

(4)7

9

+3

10

-2

9

+17

10

(5)7

15

+7

12

+8

15

-7

12

(6)15

11

-3

8

-5

8

参考答案

(1)6.12+37+2.88+47
=(6.12+2.88)+(37+47),
=9+1,
=10;
(2)2924-(524-49)
=2924-524+49
=2424+49
=149
(3)1811-(711+38),
=1811-711-38
=1111-38
=1-38
=58
(4)79+310-29+1710
=(79-29)+(310+1710),
=59+2010
=259
(5)715+712+815-712
=(715+815)+(712-712),
=1515+0,
=1;
(6)1511-38-58
=1511-(38+58),
=1511-1,
=411

考点:过程,方法