问题 解答题

用简便方法计算下列各题.

19×8×125               38+129+71                1756-398

406×201                  16×125                  1900÷4÷25.

答案

(1)119×8×125,

=119×(8×125),

=119×1000,

=119000;

(2)38+129+71,

=38+(129+71),

=38+200,

=238;

(3)1756-398,

=1756-400+2,

=1356+2,

=1358;

(4)406×201,

=406×(200+1),

=406×200+406×1,

=81200+406,

=81606;

(5)16×125,

=2×8×125,

=2×(8×125),

=2×1000,

=2000;

(6)1900÷4÷25,

=1900÷(4×25),

=1900÷100,

=19.

单项选择题
单项选择题