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y-(30%+25%)y=33y=?更新:quick!!!!!!!!!!
y - (0.3+0.25)y = 33 y - 0.55y = 33 0.45y =33 y = 33/0.45 = 73.333... = 73 + 1/3
終於有人答了^^為何不作答？？？？？？
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https://tw.answers.yahoo.com/question/index?qid=20141029000016KK03692