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计算下面各题 能用简便算法的就用简便算法. (1)710÷9+310×19(2)75-58-

2022-08-14 02:36:36 问答库 阅读 200 次

问题详情

计算下面各题,能用简便算法的就用简便算法. (1)7

10

÷9+3

10

×1

9

(2)7

5

-5

8

-9

16

÷3

2

(3)(3

4

-1

8

)÷5

12

(4)4

5

÷[(1

2

+2

5

)×2

3

].

参考答案

(1)710÷9+310×19,
=710×19+310×19,
=(710+310)×19,
=1×19,
=19;

(2)75-58-916÷32,
=75-58-38,
=75-(58+38),
=75-1,
=25;

(3)(34-18)÷512,
=58÷512,
=32;

(4)45÷[(12+25)×23],
=45÷[910×23],
=45÷35,
=43.

考点:算法