题目内容
| 动脑筋,用简便方法计算. 185+198 | 195+68+32 | 31×4×5 | 32×25. |
(1)185+198
=185+200-2
=385-2
=383;
(2)195+68+32
=195+(68+32)
=195+100
=295;
(3)31×4×5
=31×(4×5)
=31×20
=620;
(4)32×25
=8×(4×25)
=8×100
=800.
=185+200-2
=385-2
=383;
(2)195+68+32
=195+(68+32)
=195+100
=295;
(3)31×4×5
=31×(4×5)
=31×20
=620;
(4)32×25
=8×(4×25)
=8×100
=800.
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