问题 解答题
用简便方法计算下面各题.
(1)384-198
(2)208+699
(3)125×32(4)630÷35÷2.
答案

(1)384-198,

=384-(200-2),

=384-200+2,

=186;

(2)208+699,

=208+(700-1),

=208+700-1,

=907;

(3)125×32,

=125×8×4,

=1000×4,

=4000;

(4)630÷35÷2,

=630÷(35×2),

=630÷70,

=9.

单项选择题
单项选择题