问题 解答题

用简便方法计算.

201×42

47×48+48×53

137×46-37×46

125×32×25.

答案

(1)(200+1)×42

=200×42+1×42,

=8400+42,

=8442;

(2)47×48+48×53

=(47+53)×48,

=100×48,

=4800;

(3)137×46-37×46

=(137-37)×46,

=100×46,

=4600;

(4)125×32×25

=(125×8)×(4×25),

=100×100,

=10000.

判断题
单项选择题