用简便方法计算．513×17+813÷7_刷题宝

题干

用简便方法计算．

513

×17

+813

÷7

上一题下一题 0.0难度选择题更新时间:2018-05-23 04:39:15

答案(点此获取答案解析）

解：原式=

$\frac{5}{13} \times \frac{1}{7} + \frac{8}{13}$

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