题目内容
| 用简便方法计算下面各题. 3.8×6.7+3.3×3.8 | 1.28×0.29-0.29×0.28 | 101×4.8 | 56×12.5. |
(1)3.8×6.7+3.3×3.8,
=3.8×(6.7+3.3),
=3.8×10,
=38;
(2)1.28×0.29-0.29×0.28,
=0.29×(1.28-0.28),
=0.29×1,
=0.29;
(3)101×4.8,
=(100+1)×4.8,
=100×4.8+1×4.8,
=480+4.8,
=484.8;
(4)56×12.5,
=7×(8×12.5),
=7×100,
=700.
=3.8×(6.7+3.3),
=3.8×10,
=38;
(2)1.28×0.29-0.29×0.28,
=0.29×(1.28-0.28),
=0.29×1,
=0.29;
(3)101×4.8,
=(100+1)×4.8,
=100×4.8+1×4.8,
=480+4.8,
=484.8;
(4)56×12.5,
=7×(8×12.5),
=7×100,
=700.
练习册系列答案
相关题目