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数学
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17/19[(4/9+1/2)*9/17]简算
人气:330 ℃ 时间:2020-05-05 10:59:24
解答
17/19[(4/9+1/2)*9/17]
=17/19×9/17×(8/18+9/18)
=9/19×17/18
=17/38
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