x的平方减去2x减去3等于0的解题步骤 x的平方减去2x减3=0是数学哪里的知识，求解，要过程
x\u7684\u5e73\u65b9\u52a02x\u51cf3\u7b49\u4e8e0\uff0c\u6c42\u89e3\uff0c\u6c42\u6b65\u9aa4\u662f\u914d\u65b9\u6cd5\uff0c\u8fc7\u7a0b\uff1a\u539f\u5f0f\u5316\u4e3a\uff1ax²-2x+1-4=0 \uff08x-1\uff09²=4 x-1=\u00b12 \u6545x=3\u6216x=-1
x²-2x-3=0x²-2x=3
x²-2x+1=4
(x-1)²=(±2)²
x-1=±2
x=-1,x=3
绛旓細姹 x²鈥2x鈥3=0 瑙 浜屽厓涓娆℃柟绋---浠ヤ笅鎴戠敤閰嶆柟寮忚缁嗘瘡姝ユ楠---鎶婂父鏁伴」绉婚」寰楋細x²-2x=3 绛夊紡涓よ竟鍚屾椂鍔1(鏋勬垚瀹屽叏骞虫柟寮)寰楋細x²-2x+1=4 鍥犲紡鍒嗚В寰楋細(x-1)²=4 鈭磋В寰楋細x=-1 鎴 x=3 鎵浠ヨВ闆嗕负{x | x锛3鎴-1} 鐢ㄩ厤鏂规硶鐨勫皬鍙ｈ瘈锛氫簩娆＄郴鏁板寲涓...
绛旓細x鐨勫钩鏂瑰噺2x鍑3绛変簬0 x=3锛寈=-1 2x鍑14x鍔5 = 5-12x 绛変簬璐31锛屾垨鑰呰礋7
绛旓細瑕佷娇鍒嗗紡鏈夋剰涔,x涓绛変簬0鍜3,瑕佷娇鍒嗗紡鐨勫涓0,鍒x鐨勫钩鏂锛2x锛3锛0,瑙ｅ緱x锛3鎴杧锛濓紞1.鍥犱负x涓绛変簬3,鑸嶅幓,鎵浠鐨勫间负锛1.
绛旓細閮暒椤掑洖绛旓細闆嗗悎A={x|x²锛2x锛3=0}锛孊={x|mx锛3=0}锛孉={锛1锛3}锛孊={3/m}锛孊⊂锛堝寘鍚簬锛堿锛屽綋3/m=3鏃讹紝m=1锛涘綋3/m=锛1鏃讹紝m=锛3锛屸埓m=1锛屾垨m=锛3銆
绛旓細x鐨勫钩鏂瑰噺2x鍑3绛変簬0,姹傚畬鏁寸殑杩囩▼鍜岃В棰樻濊矾 鎴戞潵绛 5涓洖绛 #鐑# 鍏堜汉涓姝,鎺㈢鍗庝负P50瀹濈洅 鍖垮悕鐢ㄦ埛 2014-11-08 灞曞紑鍏ㄩ儴 鏇村杩介棶杩界瓟 杩介棶 涓轰粈涔堜笉鏄-3鍜1鍛? 杩界瓟 鍥犲紡鍒嗚В 鏈洖绛旂敱鎻愰棶鑰呮帹鑽 宸茶禐杩 宸茶俯杩< 浣犲杩欎釜鍥炵瓟鐨勮瘎浠锋槸? 璇勮 鏀惰捣 鍖垮悕鐢ㄦ埛 2014-11-08 ...
绛旓細鍥犱负a>0,鎵浠ユ姏鐗╃嚎寮鍙ｅ悜涓,涓巟杞寸浉浜ょ殑涓や釜鐐圭殑涓嬫柟涓鸿礋鍊硷紙灏忎簬0锛,姹倄^2-2x-3=0鐨涓や釜瑙.瑙ｆ柟绋媥^2-2x+1-4=0,(x-1)^2=4,x-1=2,x-1=-2,x1=3,x2=-1,鎵浠,-1
绛旓細鍗(x-3)(x+1)>0 鎵浠<-1,x>3 鍏蜂綋鏉ヨ (x-x1)(x-x2)>0 涓攛1<x2 鍒檟<x1,x>x2 (x-x1)(x-x2)<0 涓攛1<x2 鍒檟1<x<x2
绛旓細鍏堢畻x^2 -2x -3>=0鐨鍖洪棿锛屽緱锛-鈭烇紝-1] 鍑鍖洪棿, [3, +鈭)澧炲尯闂 y=鏍瑰彿锛坺锛夋槸涓涓鍑芥暟, 鎵浠ラ掑噺鍖洪棿鏄 锛-鈭烇紝-1]
绛旓細杩鏄涓閬撴潵鑷墜鏈虹殑闂 鎮ㄧ殑鍥炵瓟琚噰绾冲悗灏嗚幏寰楃郴缁熷鍔20(璐㈠瘜鍊+缁忛獙鍊) +绱фユ彁闂鍔0(璐㈠瘜鍊+缁忛獙鍊) 鎴戞湁鏇村ソ鐨勭瓟妗堝垎浜埌: 鎸夐粯璁ゆ帓搴弢鎸夋椂闂存帓搴 1鏉″洖绛 2013-10-16 14:41userkool|鍗佺骇 瑙:鏂圭▼x²-2x-4=0閰嶆柟寰:(x-1)²-5=0,鍗:(x-1)²=5鎵浠:x-1=卤鈭5,x=1-鈭5鎴杧...
绛旓細X^2-2X-3=(X+1)(X-3)<0,鎵浠-1<X<3.寰堢畝鍗曠殑棰樼洰銆傚涔犺鑷繁鍏堢爺绌惰繃锛屽疄鍦ㄤ笉浼氭墠鍚戝埆浜烘眰鍔╋紝纰板埌涓鐐逛笉浼氬氨闂槸鎳掓儼鐨勮〃鐜帮紝濂借嚜涓轰箣銆
