题目内容
| 用简便方法计算下面各题. (1)384-198 | (2)208+699 |
| (3)125×32 | (4)630÷35÷2. |
(1)384-198,
=384-(200-2),
=384-200+2,
=186;
(2)208+699,
=208+(700-1),
=208+700-1,
=907;
(3)125×32,
=125×8×4,
=1000×4,
=4000;
(4)630÷35÷2,
=630÷(35×2),
=630÷70,
=9.
=384-(200-2),
=384-200+2,
=186;
(2)208+699,
=208+(700-1),
=208+700-1,
=907;
(3)125×32,
=125×8×4,
=1000×4,
=4000;
(4)630÷35÷2,
=630÷(35×2),
=630÷70,
=9.
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