问题 解答题

脱式计算(怎样算简便就怎样算).

(18.6-18.6÷3.1)×1.6

12.5×2.5×3.2

4.5÷18

32.9×0.46+5.4×3.29.

答案

(1)(18.6-18.6÷3.1)×1.6,

=(18.6-6)×1.6,

=12.6×1.6,

=20.16,

(2)12.5×2.5×3.2,

=(12.5×8)×(2.5×0.4),

=100×1,

=100,

(3)4.5÷18=0.25,

(4)32.9×0.46+5.4×3.29,

=3.29×(4.6+5.4),

=3.29×10,

=32.9.

多项选择题
单项选择题