题目内容
巧用方法求总和.
| 450 | 460 | 470 |
| 480 | 490 | 500 |
| 510 | 520 | 530 |
(1)450+460+470
=460×3,
=1380;
(2)480+490+500,
=490×3,
=1470;
(510+520+530,
=520×3,
=1560.
=460×3,
=1380;
(2)480+490+500,
=490×3,
=1470;
(510+520+530,
=520×3,
=1560.
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