Billy想买一支钢笔,在超市里与售货员(Saleswoman)讲价,最后以5元价钱成交。请以此为信息，编写一则对话。用
\u660e\u660e\u548c\u4f73\u4f73\u53bb\u8d85\u5e02\u4e70\u94a2\u7b14,\u4e00\u652f\u94a2\u7b14\u5341\u4e8c\u5143,\u4ed6\u4eec\u5404\u4e70\u4e86\u4e00\u652f,\u660e\u660e\u7ed9\u4e86\u552e\u8d27\u54588\u5f20\u6574\u94b1\u7ed9\u5c11\u4e86\uff0c\u552e\u8d27\u5458\u8981\u4e0d\u9ad8\u5174\u60f9
\u8bf7\u5f8b\u5e08\u4ecb\u5165\uff0c\u8c03\u51fa\u76d1\u63a7\u89c6\u9891\u8d44\u6599\uff0c\u544a\u5012\u4ed6\uff01
Saleswoman:May I help you?Billy:Oh,I need a pen.
Saleswoman:What do you think about this one?
Billy:I like blue,not red.
Saleswoman:Ok, how about this one?
Billy:how much is it?
Saleswoman:Five yuan.
Billy:That's right.
Saleswoman:Ok,thank you very much,see you next time.
Billy:Thanks,bye-bye.
请不要设方程，给我算式，3Q了大家！ ...(24*2-25.5)/（4*2-3）=4.5 元 是钢笔的价钱 （25.5-3*4.5）/6=2元 是墨水的价钱 ...3x+...
绛旓細Saleswoman:Ok,thank you very much,see you next time.Billy:Thanks,bye-bye.
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