70. original selling price=加上x% 后的retail price, and final sale price=y倍的original selling price, Ask final price?
A xy的值
B 3x+4Y的值
参考答案：A
思路：
73. both A and B are positive integers with three digits. The thousandth digit of A is 1 more than that of B, the tenth digit of A is 2 less than that of B, Ask the difference between the two figures?
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发表于 2003-8-25 15:59:00
发表于 2003-8-25 16:00:00
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