f(x)=√(x^2+9)
f(x)=9
x=?
想問點拆走個開方根?
唔識將(x^2+9)因式分解...想知a^2+b^2點factorization..
收錄日期: 2021-04-12 22:15:16
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061110000051KK02747