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问答题
I bought four things this morning. The dictionary was 5 times the cost of the book, the tie was 30 times the cost of the book，the watch was 4 times the cost of the tie, and I spent 312 dollars in total. What was the price of the dictionary?
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解析：
假设字典的价格为x，那么书的价格为1/5x,领带的价格为30×1/5x,手表为4×30×1/5x,这些东西的总价值为312，因此可得方程式x+1/5x+30×1/5x+4×30×1/5x=312，故x=10。
假设字典的价格为x，那么书的价格为1/5x,领带的价格为30×1/5x,手表为4×30×1/5x,这些东西的总价值为312，因此可得方程式x+1/5x+30×1/5x+4×30×1/5x=312，故x=10。
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