y=x^2+2x=(x+1)^2-1谁告诉我解题过程，怎么得来的，
y+2=1/(x+1)所以函数y=1/x的图像先向左移一个单位，再向下移两个单位就得到y=(-2x-1)/(x+1)的图像先凑成完全平方式：y=x∧2+2x+1=（x+1)∧2这不是多加了个1,要使原值不变所以再给后面减个1得：y=(x+1)∧2-1
配方法是初中必须掌握的很重要在高中也有很大的用途要多练练哦
y=x^2+2x=x^2+2x+1-1=(x^2+2x+1)-1=(x+1)^2-1
+1-1等于不加不减，凑出一个1配成完全平方公式
绛旓細绠鍗曡绠椾竴涓嬪嵆鍙紝绛旀濡傚浘鎵绀
绛旓細閬撶悊涓鏍 y"=[2(lnx+1)]'*[x^(2x)]+2(lnx+1)*[x^(2x)]'[2(lnx+1)]'=2*1/x=2/x [x^(2x)]'=2(lnx+1)[x^(2x)]鎵浠"=2*[x^(2x)]/x+2(lnx+1)*2(lnx+1)[x^(2x)]鍗硑"=2*x^(2x-1)+4(lnx+1)^2[x^(2x)]...
绛旓細y=x^2-2x+1,(-1<=x<=1)鍙樻垚x=y^2-2y+1,(-1<=y<=1)鍗x=(y-1)^2,(-1<=y<=1) 鍗 y=鏍瑰彿x+1鎴杫=-鏍瑰彿x+1涓嬮潰姹傚畾涔夊煙:鍥犱负-1<=y<=1,鎵浠-2<=y-1<=0,鎵浠0<=(y-1)^2<=4鍗0<=x<=4缁间笂,鐭:鍑芥暟f(x)=x^2-2x+1,(-1<=x<=1)鐨勫弽鍑芥暟鏄 y=鏍瑰彿x+1鎴杫=-...
绛旓細rt锛岃缁嗚繃绋嬪鍥撅紝甯屾湜鑳藉府鍒颁綘瑙ｅ喅闂
绛旓細绗竴涓〃绀哄嚱鏁扮殑鍊煎煙 y=x^2+2x-3=(x+1)^2-4鈮-4 M={y|y鈮-4} 绗簩涓槸涓嶇瓑寮忕殑瑙ｉ泦 |y-2|鈮3 -3鈮-2鈮3 -1鈮鈮5 N ={y|-1鈮鈮5} M鈭㎞={y|-1鈮鈮5} 閫塀
绛旓細姹傚杩囩▼璇︾粏姝ラ濡備笅鍥炬墍绀:
绛旓細2013-08-23 璁綳鐨勬鐜囧瘑搴︿负f(x)=3x^2,0<x<1,姹Y=-2X... 2012-12-07 姒傜巼璁:宸茬煡X鐨勬鐜囧瘑搴﹀嚱鏁颁负F(X)=2X,0<x<1 ;... 2012-01-07 璁綳鐨勬鐜囧瘑搴︿负f(x)=2x ,0<X<1 ;0,鍏朵粬,姹... 2015-02-08 璁鹃殢鏈哄彉閲廥鐨勬鐜囧瘑搴﹀嚱鏁颁负f(x)=2x, 0<x<1...鏇村...
绛旓細绮楃暐鍦拌В浜嗕竴涓嬶紝璇疯鍥剧墖
绛旓細X = 1,鍒 Y = 0,鍒囩偣 Q(1,0).Y 鍦 Q 鐐圭殑涓闃跺鏁板 Y' = 2 + 2 = 4 灏辨槸鎵姹傚垏绾跨殑鏂滅巼,鐢辩偣鏂滃紡,鎵姹傚垏绾挎柟绋 Y = 4锛圶 - 1) .
绛旓細(1)y=x^2-2x+1=(x-1)^2,姝ゅ嚱鏁板湪锛堣礋鏃犵┓锛1]鏄噺鍑芥暟锛屽湪[1锛屾鏃犵┓]鏄鍑芥暟銆傛墍浠ュ綋 a>1鏃讹紝鏈夋渶灏忓 锛坅-1)^2,鏈澶у糰^2,褰揳<0鏃讹紝鏈夋渶灏忓糰^2,鏈澶у(a-1)^2..褰0<=a<=1/2鏃讹紝鏈夋渶灏忓0锛屾渶澶у硷紙a-1)^2.褰1/2<a<=1鏃讹紝鏈夋渶灏忓0銆傛渶澶у糰^2....
