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计算下面各题 能简算的要用简便方法计算.2008-900÷15×120.5×(1.6+4.2

2022-08-14 02:44:42 问答库 阅读 200 次

问题详情

计算下面各题,能简算的要用简便方法计算.
2008-900÷15×12
0.5×(1.6+4.2÷0.3)
3

5

+4

11

+2

5

+7

11


(3

4

-3

4

×5

6

)÷9

8


5

12

÷[3

8

×(7

9

-1

2

)]
45×(8

9

+2

15

-3

5

)

参考答案

(1)2008-900÷15×12
=2008-60×12,
=2008-720,
=1288;
(2)0.5×(1.6+4.2÷0.3)
=0.5×(1.6+14),
=0.5×15.6,
=7.8;
(3)35+411+25+711
=(35+25)+(411+711),
=1+1,
=2;
(4)(34-34×56)÷98
=[(1-56)×34)]÷98,
=[16×34]×89,
=18×89;
=19;
(5)512÷[38×(79-12)]
=512÷[38×518],
=512×485,
=4;
(6)45×(89+215-35)
=45×89+45×215-45×35,
=40+6-27,
=19.

考点:方法