問題詳情
30. 某鞋店有甲、乙兩款鞋各 30 雙，甲鞋一雙 200 元，乙鞋一雙 50 元。該店促銷的方式：買一雙甲鞋，送一雙乙鞋；只買乙鞋沒有任何優惠。若打烊後得知，此兩款鞋共賣得 1800 元，還剩甲鞋 x 雙、乙鞋 y 雙，則依題意可列出下列哪一個方程式？
(A) 200(30 −x ) +50(30-y)= 1800
(B) 200(30 −x ) +50(30-x-y)= 1800
(C) 200(30 −x ) +50(60-x-y)= 1800
(D) 200(30 −x ) +50[30-(30-x)-y]= 1800
(A) 200(30 −x ) +50(30-y)= 1800
(B) 200(30 −x ) +50(30-x-y)= 1800
(C) 200(30 −x ) +50(60-x-y)= 1800
(D) 200(30 −x ) +50[30-(30-x)-y]= 1800
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