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计算下面各题 能用简便方法计算的用简便方法计算.41×1017.8+310+2.2+7107

2022-08-14 02:33:08 问答库 阅读 200 次

问题详情

计算下面各题,能用简便方法计算的用简便方法计算.
41×1017.8+3

10

+2.2+7

10

72×(3

8

+4

9

)

2.5×1.25×32[1-(1

5

+3

10

)]÷1

4

(2

3

-7

12

)÷(2

7

+1

8

)

参考答案

(1)41×101,
=41×100+41×1,
=4100+41,
=4141;

(2)7.8+310+2.2+710,
=(7.8+2.2)+(310+710),
=10+1,
=11;

(3)72×(38+49),
=72×38+72×49,
=27+32,
=59;

(4)2.5×1.25×32,
=(2.5×4)×(1.25×8),
=10×10,
=100;

(5)[1-(15+310)]÷14,
=[1-12]÷14,
=12÷14,
=2;

(6)(23-712)÷(27+18),
=112÷2356,
=1469.

考点:方法