\(^o^)/~\(^o^)/~\(^o^)/~\(^o^)/~\(^o^)/~\(^o^)/~
ç±2x+4y=1å¾y=ï¼1-2xï¼/4ï¼ä»£å
¥x^2+y^2=... ï¼
å¾x²+ï¼1-2xï¼²/16=... ï¼
ï¼20X²-4X+1ï¼/16=...ï¼
ç»ä¸ä¸ª...çå
·ä½å¼å°±å¯ä»¥è§£åºX ï¼æå¼ä¹å¯ä»¥ç®\(^o^)/~
æ±æå¼çè¯åºè¯¥ç¨æ¯è¥¿ä¸çå¼ï¼ä¸ç¨åºæ¬ä¸çå¼ã
ï¼x²+y²ï¼ï¼2²+4²ï¼â¥ï¼2x+4yï¼²=1
x²+y²â¥1/20
温馨提示:答案为网友推荐,仅供参考