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.