Math Question~ Pls help
回答 (1)
2008-02-23 10:07 am
✔ 最佳答案
x²y + y³ = 2 -----(1)diff. the equation (1) w. r. t. x
2xy + x² (y') = 0
y' = - 2xy / x² = -2y/x ------------(2)
diff. the equation (2) w. r. t. x
y'' = -2y/(-x²) - 2(y')/x
= 2y/x² - 2 (-2x/y)/x
= 2y/x² + 4/y
收錄日期: 2021-05-02 21:00:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080223000051KK00301