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下面各题怎样算简便就怎样算.(1)49×914÷421 (2)0.8+12÷56(3)(47

2022-08-14 02:54:07 问答库 阅读 200 次

问题详情

下面各题怎样算简便就怎样算.
(1)4

9

×9

14

÷4

21

(2)0.8+1

2

÷5

6

(3)(4

7

+3

8

)×56

(4)3

8

+4

7

+1

4

×2

5

(5)(0.25+1

3

)×(1.6÷4

5

)(6)3

4

×[1÷(5

6

+3

4

)].

参考答案

(1)49×914÷421,
=49×914×214,
=32;

(2)0.8+12÷56,
=0.8+0.6,
=1.4;

(3)(47+38)×56,
=56×47+38×56,
=32+21,
=53;

(4)38+47+14×25,
=38+47+110,
=5356+110,
=293280;

(5)(0.25+13)×(1.6÷45),
=712×2,
=76;

(6)34×[1÷(56+34)],
=34×(1÷1912),
=34×1219,
=919.

考点: