推 wangyc:Determine the envelope of y=cx+1/c(電腦作圖和手算) 09/29 12:07
→ jrhudm: ^^^^^^^^^ 這是信封的意思嗎? 09/29 14:04
推 hi08060204:我以為是大象 09/29 16:16
推 callsobing:x=y^2/4 envelope = singular solution 09/29 18:11
→ Apopo3:singular solution: 4x=y^2 (幫樓上移項一下，比較清楚~) 09/30 00:18
→ jrhudm:樓上自以為 09/30 22:39