题目内容
| 用简便方法计算 25×32 | 475+57+43 | 25×(6×4)125×16 |
| 175+201 | 451-51-49. |
(1)25×32,
=25×4×8,
=100×8,
=800;
(2)475+57+43,
=475+(57+43),
=475+100,
=575;
(3)25×(6×4),
=(25×4)×6,
=100×6,
=600;
(4)125×16,
=125×8×2,
=1000×2,
=2000;
(5)175+201,
=175+200+1,
=375+1,
=376;
(6)451-51-49,
=451-(51+49),
=451-100,
=351.
练习册系列答案
相关题目