问题 解答题

下面各题怎样简便就怎样算.

①4×0.8×2.5×12.5

②(2.8+3.85÷3.5)×4.6.

答案

①4×0.8×2.5×12.5,

=(4×2.5)×(0.8×12.5),

=10×10,

=100;

②(2.8+3.85÷3.5)×4.6,

=(2.8+1.1)×4.6,

=3.9×4.6,

=17.94.

单项选择题
单项选择题