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神机妙算细又巧.(计算下面各题能简算的要简算) (1)57×21×310(2)1835÷0.

2022-08-14 03:01:32 问答库 阅读 200 次

问题详情

神机妙算细又巧.(计算下面各题能简算的要简算) (1)5

7

×21×3

10

(2)18

35

÷0.6×2

3

(3)2-6

13

÷9

26

-2

3

(4)9

10

×[5

9

÷(1

2

-1

6

)]

(5)(0.25+1

3

)×(1.6÷4

5

)(6)(3

17

+1

39

)×17+22÷39.

参考答案

(1)57×21×310,
=5×21×37×10,
=92;

(2)1835÷0.6×23,
=1835×106×23,
=47;

(3)2-613÷926-23,
=2-43-23,
=2-(43+23),
=2-2,
=0;

(4)910×[59÷(12-16)],
=910×[59÷26],
=910×159,
=32;

(5)(0.25+13)×(1.6÷45),
=34×2,
=32;

(6)(317+139)×17+22÷39,
=317×17+139×17+2239,
=3+(1739+2239),
=3+1,
=4.

考点: