1.7s^2 + 6s^4=
2.2abcd-abc=
3.25xyz-35xy^2z^3=
4.-x^2 - 3x^2y=
ps. (^)次方
thanks~
收錄日期: 2021-05-01 18:20:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080907000051KK03163