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設這個數為X,剛X乘以四分之三等於十五 所以X等於十五除以四分之三 即:X等於十五乘以三分之四等於二十 所以X等於二十 二十乘以十分之九等於十八 先求四分之三的五分之二等於十分之三 再用十分之三除以三分之一等於十分之九
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