问题
解答题
|
答案
(1)125×24,
=125×8×3,
=1000×3,
=3000;
(2)210×21=4410;
(3)50×240=12000;
(4)199×40,
=(200-1)×40,
=200×40-1×40,
=8000-40,
=7960.
|
(1)125×24,
=125×8×3,
=1000×3,
=3000;
(2)210×21=4410;
(3)50×240=12000;
(4)199×40,
=(200-1)×40,
=200×40-1×40,
=8000-40,
=7960.