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因為是打了八五折出售,就等於按原價百分之八十五出售 所以先用1减去百分之八十五(0.85),是便宜的百分比,就等於百分之十五(0.15) 用45除以百分之十五(0.15)等於300元 所以這道題等於300. 望採納~
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