p(x+y)+q(x-y)+r=0 (chage the subject of the formula to x)
更新1:
Ax+Bx+C=0
Ax+Bx+C=0
收錄日期: 2021-04-23 20:37:51
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090803000051KK00743