13a. 2over m+5 - 9over m-6 =9
13b 8over -(m+17) + 5over m-4 = -3
14a 14over 6x+8 + 6over 5x-8 =14
比埋STEP我唔該!!
收錄日期: 2021-04-23 22:10:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101114000051KK00874