紅茶一杯20元，奶茶一杯25元，媽媽買了x杯紅茶和y杯奶茶，共花了300元，若媽媽兩種都有買，則共有幾種買法？(A)1 (B)2 (C)3 (D)4

問題詳情

3. 紅茶一杯20元，奶茶一杯25元，媽媽買了x杯紅茶和y杯奶茶，共花了300元，若媽媽兩種都有買，則共有幾種買法？
(A)1
(B)2
(C)3
(D)4

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