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<worksheetText above="第8題 安華帶了60元上市場買柳丁和葡萄柚· 如果柳丁每個6元,葡萄柚每個10元, 安華購買柳丁的個數至少是葡萄柚個數的2倍, 且柳丁與葡萄柚至少各買一個,那麼安華有多少種購買的方法?" below="令柳丁買 x 顆 葡萄柚買 y 顆 聯立式 x >= 1 y >=1 6x + 10 y <= 60 x >= 2y可得右圖 可知 y 可以買 1 顆或兩顆 討論 y = 1 則 2 <= x <= 8.? 共有 7 組解 討論 y = 2 則 4 <= x <= 6.? 共有 3 組解 "/>
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