问题 解答题

计算下面各题

63×1.25×0.83.5×2.5-0.5×3.515.8÷2.5÷47.65-0.65×4.

答案

(1)63×1.25×0.8,

=63×(1.25×0.8),

=63×1,

=63;

(2)3.5×2.5-0.5×3.5,

=3.5×(2.5-0.5),

=3.5×2,

=7;

(3)15.8÷2.5÷4,

=15.8÷(2.5×4),

=15.8÷10,

=1.58;

(4)7.65-0.65×4,

=7.65-2.6,

=5.05.

单项选择题
单项选择题