题目内容

【题目】脱式计算.(能简算的要简算)

3.5×0.16÷0.8= 2.1÷0.25×4= 93÷0.31÷3

46.69÷2.3÷0.5 92÷8÷1.25 0.252÷1.2÷0.05.

【答案】0.7,33.6,100,40.6,9.2,4.2

【解析】

试题分析:(1)可根据乘法结合律计算;

(2)(4)按从左到右的顺序计算即可;

(3)(5)(6)可根据一个除以两个数,等于用这个数除以这两个数的积的除法性质进行计算;

解:(1)3.5×0.16÷0.8

=3.5×(0.16÷0.8),

=3.5×0.2,

=0.7;

(2)2.1÷0.25×4

=8.4×4.

=33.6;

(3)93÷0.31÷3

=93×(0.31×3),

=93÷0.93,

=100;

(4)46.69÷2.3÷0.5

=20.3÷0.5,

=40.6;

(5)92÷8÷1.25

=92÷(8×1.25),

=92÷10,

=9.2;

(6)0.252÷1.2÷0.05

=0.252÷(1.2×0.05),

=0.252÷0.06,

=4.2.

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