题目内容
选择合适的方法计算.
| 31×38+52×31 | 608×[÷84] |
(1)31×38+52×31,
=31×(38+52),
=31×90,
=2790;
(2)608×[÷84],
=608×[1092÷84],
=608×13,
=7904.
=31×(38+52),
=31×90,
=2790;
(2)608×[÷84],
=608×[1092÷84],
=608×13,
=7904.
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