(9+2/7+7+2/9)/(5/7+5/9)用简便方法计算
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(9+2/7+7+2/9)/(5/7+5/9)用简便方法计算(9+2/7+7+2/9)/(5/7+5/9)用简便方法计算(9+2/7+7+2/9)/(5/7+5/9)用简便方法计算
(9+2/7+7+2/9)/(5/7+5/9)用简便方法计算
(9+2/7+7+2/9)/(5/7+5/9)用简便方法计算
(9+2/7+7+2/9)/(5/7+5/9)用简便方法计算