用配方法解方程2x的平方-3x-1=0
\u6570\u5b66\u516c\u5f0f\u5927\u5168\uff0c\u8f93\u5165\u751f\u65e5\uff0c\u53ef\u4ee5\u67e5\u4e00\u751f\u547d\u6570\uff0c\u51c6\u5230\u5413\u4eba! 你那个2X的平方指的应该是（2X）^2吧？如果是那么原式等于（X－1）（4X+1）=0x=1或x=-1/4
绛旓細2x²-3x-5=0;2(x²-3x/2)-5=0;2(x-3/4)²=5+9/8;2(x-3/4)²=49/8;(x-3/4)²=49/16;x-3/4=卤7/4;x=5/2鎴杧=-1;鏈夊府鍔╄寰楀ソ璇勶紝鏂伴棶棰樿閲嶆柊鍙戝笘鎻愰棶锛岃繖閲屼笉鍐嶅洖绛旇阿璋
绛旓細鏄繖鏍风殑锛-2x -1 -x 1 鍗筹紙-2x-1锛(-x+1)=0 瑙ｅ緱x=1,x=-1/2
绛旓細2x骞虫柟锛3x锛6锛0 瑙ｏ細x²-3/2x=3 x²-3/2x+9/16=3+9/16 (x-3/4)²=57/16 x-3/4=卤鈭57/4 x=3/4卤鈭57/4
绛旓細閰嶆柟娉曡В鏂圭▼锛屾柟娉曞涓嬶細1銆侀鍏堬紝鍏堣繘琛岀Щ椤癸紝鍗冲皢鏂圭▼宸﹁竟鐨勫父鏁扮Щ鍒版柟绋嬪彸杈广2銆佸湪瀵规柟绋嬭繘琛岄厤鏂癸紝鎴戜滑閫夋嫨涓娆￠」鐨勭郴鏁伴櫎浠2浣滀负鏂圭▼宸﹁竟鐨勫父鏁帮紝鍐嶅皢甯哥啛骞虫柟锛屾斁缃柟绋嬪乏杈广傛柟绋嬪彸杈逛篃鍔犺甯告暟鐨勫钩鏂锛屼娇宸﹀彸鐩哥瓑銆3銆佹柟绋嬪乏杈规暣鐞嗘垚骞虫柟鐨勫舰寮忥紝鍐嶅皢鍙宠竟绯绘暟鏁村悎銆4銆佹渶鍚庨氳繃鍥犲紡鍒嗚В璁＄畻缁撴灉銆
绛旓細2016-07-29 璇烽棶2x²-3x-6=0鐢ㄩ厤鏂规硶瑙ｆ柟绋 4 2008-08-06 2X2-3X-1=0鐢ㄩ厤鏂规硶瑙ｆ柟绋,鎬庝箞瑙?? 4 2017-04-07 2x²-3x-5=0 4 2018-10-07 鐢ㄩ厤鏂规硶瑙ｆ柟绋:2x²+2x-4=0 9 2014-10-11 鐢ㄩ厤鏂规硶瑙ｆ柟绋2x²-5x+3=0 5 2013-08-15 閰嶆柟娉曡В涓鍏冧簩娆℃柟绋(1)2x²-3x-5=...
绛旓細2x²-3x-6=0鐨勮В锛歺 = (3卤鈭57) / 4銆閰嶆柟娉瑙ｇ瓟杩囩▼濡備笅锛2x²-3x-6=0 x² - 3/2 x - 3 =0 x² - 3/2 x + 9/16 = 3 + 9/16 (x -3/4)² = 57/16 x -3/4 = 卤鈭57 /4 x = (3卤鈭57) / 4 ...
绛旓細杩欓涓鐪嬪氨鐭ラ亾鏃犺В锛屾墍浠ユ垜璇佹槑鏃犺В灏卞彲浠ヤ簡銆傚叿浣撶畻涔熷垪涓涓嬶細2x^2-3x+2=0 2[x^2-3/2x+(3/4)^2]-9/8+2=0 2(x-3/4)^2=-7/8 锛坸-3/4)^2=-7/16 鍥犳鏃犺В
绛旓細瑙ｇ敱2x^2-3x-6=0 寰梮^2-3/2x-3=0 鍗硏^2-3/2x+锛3/4)^2-锛3/4)^2-3=0 鍗筹紙x-3/4)^2-9/16-3=0 鍗筹紙x-3/4)^2-9/16-48/16=0 鍗筹紙x-3/4)^2=57/16 寮鏂瑰緱 锛坸-3/4)=鈭57/4鎴栵紙x-3/4)=-鈭57/4 瑙ｅ緱x=锛3+鈭57锛/4鎴栵紙3-鈭57锛/4 ...
绛旓細2x²-3x+1=0 2x²-3x=-1 x²-3x/2=-1/2 x²-3x/2+9/16=-1/2+9/16=1/16 (x-3/4)²=(卤1/4)²x-3/4=卤1/4 x=(3卤1)/4 鎵浠=1/2锛寈=1
绛旓細2x^2-3x+3=0 ===> 2[x^2-(3/2)x+(9/16)]=-3+(9/8)===> 2*[x-(3/4)]^2=-15/8 ===> [x-(3/4)]^2=-15/16锛0 鎵浠,鍘鏂圭▼鏃犲疄鏁拌В.
