问题
解答题
用简便方法计算.
(1)16×4×25
(3)125×28
(2)125×(17×8)
(4)25×32×125.
答案
(1)16×4×25,
=16×(4×25),
=1600;
(2)125×28,
=(125×4)×7,
=500×7,
=3500;
(3)125×(17×8),
=(125×8)×17,
=1000×17,
=17000;
(4)25×32×125,
=(25×4)×(8×125),
=100×1000,
=100000.