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5分之2÷(17分之8÷13+13分之1×17分之9)
人气:469 ℃ 时间:2020-04-02 12:13:39
解答
2/5÷(8/17÷13+1/13×9/17)
=2/5÷(8/17×1/13+1/13×9/17)
=2/5÷1/13×(8/17+9/17)
=2/5×13
=26/5
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