题目内容
| 用简便方法计算. 256×7-56×7 | 125×(8+4) |
| 22×35 | 99×99+99. |
(1)256×7-56×7,
=(256-56)×7,
=200×7,
=1400;
(2)125×(8+4),
=125×8+125×4,
=1000+500,
=1500;
(3)22×35,
=(20+2)×35,
=20×35+2×35,
=700+70,
=770;
(4)99×99+99,
=99×(99+1),
=99×100,
=9900.
=(256-56)×7,
=200×7,
=1400;
(2)125×(8+4),
=125×8+125×4,
=1000+500,
=1500;
(3)22×35,
=(20+2)×35,
=20×35+2×35,
=700+70,
=770;
(4)99×99+99,
=99×(99+1),
=99×100,
=9900.
练习册系列答案
相关题目