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  3. The result obtained when x is multiplied by y is equal to ten times the result obtained when y is subtracted from x. If y equals

The result obtained when x is multiplied by y is equal to ten times the result obtained when y is subtracted from x. If y equals

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问题 The result obtained when x is multiplied by y is equal to ten times the result obtained when y is subtracted from x. If y equals 5, what does x equal?
选项 A、50
B、25
C、15
D、10
E、5
答案D
解析 本题考查方程的列写，由题意得到：
xy=10(x-y)，
把y=5代入得到x=10。
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