基本的需求曲線函數問題
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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推
05/28 20:58, , 1F
05/28 20:58, 1F
→
05/28 22:26, , 2F
05/28 22:26, 2F
推
05/29 02:11, , 3F
05/29 02:11, 3F
→
05/29 02:12, , 4F
05/29 02:12, 4F
→
05/29 02:12, , 5F
05/29 02:12, 5F
→
05/29 02:13, , 6F
05/29 02:13, 6F
推
05/29 02:43, , 7F
05/29 02:43, 7F
→
05/29 11:02, , 8F
05/29 11:02, 8F
→
05/29 11:02, , 9F
05/29 11:02, 9F
→
05/29 11:02, , 10F
05/29 11:02, 10F
推
05/29 11:30, , 11F
05/29 11:30, 11F
推
05/29 11:43, , 12F
05/29 11:43, 12F
→
05/29 11:43, , 13F
05/29 11:43, 13F
→
05/29 11:44, , 14F
05/29 11:44, 14F
→
05/29 11:45, , 15F
05/29 11:45, 15F
推
05/30 00:44, , 16F
05/30 00:44, 16F
→
05/30 00:44, , 17F
05/30 00:44, 17F
→
05/30 00:47, , 18F
05/30 00:47, 18F
推
05/30 01:32, , 19F
05/30 01:32, 19F
→
05/30 01:33, , 20F
05/30 01:33, 20F
→
05/30 01:43, , 21F
05/30 01:43, 21F
→
05/30 01:43, , 22F
05/30 01:43, 22F
推
05/30 02:08, , 23F
05/30 02:08, 23F
→
05/30 02:08, , 24F
05/30 02:08, 24F
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