基本的需求曲線函數問題 - 經濟

By Elvira
at 2017-05-28T17:59
at 2017-05-28T17:59
Table of Contents
如圖,想請問各位大大,為什麼從第一式到第二式,
前面的負數就默默不見了?完全不懂啊啊
拜託幫忙解惑!!謝謝
http://imgur.com/54fczXI
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