(x-1)(x-2)等于多少？ X(X-1)-(X+1)(X-2)等于多少？
x(x-1)(x-2)\u7b49\u4e8e\u591a\u5c11\uff1f\u4ed6\u7684\u7b54\u6848\u662fx\u7684\u4e09\u6b21\u65b9\u51cf\u53bb\u4e09x\u7684\u4e8c\u6b21\u65b9\u52a0\u4e0a2x.
解：=x²-2x-x+2
=x²-3x+2
解：原式＝X＾一（2＋1）X
＋2＝X＾一3X＋2
绛旓細(x-1)(x-2)瑙ｏ細=x²-2x-x+2 =x²-3x+2
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绛旓細y=锛坸-1锛夛紙x-2锛=x²-3x+2=锛坸-1.5锛²-0.25锛屽彲鐭鈮-0.25锛寉+0.25=锛坸-1.5锛²锛寈-1.5=卤鈭氾紙y+0.25锛夛紝x=1.5卤鈭氾紙y+0.25锛夛紝璇锋敞鎰忚繖涓嶆槸涓涓嚱鏁般
绛旓細锛1锛涓嶅 浣犺繖绉嶆柟娉曞彧鑳藉湪宸﹁竟鐨勫紡瀛=0鐨勬椂鍊 杩欎釜鏂圭▼搴旇杩欐牱瑙 瑙ｏ細x²-3x+2-3=0 x²-3x-1=o (x-1.5)²-3.25=0 (x-1.5)²=3.25 寮骞虫柟 鍚庨潰鎵撲笅鏉ュお楹荤儲浜 鑷繁鍐 锛2锛鐪嬪埌杩欑寮忓瓙 棣栧厛瑕佹兂鍒伴厤鏂 鍙浣縜鍦ㄧ被浼硷紙a+鎴-b锛²...
绛旓細锛坸锛1锛夛紙x锛2锛锛坸锛3锛夛紙x锛4锛夛紳锛伙紙x锛1锛夛紙x锛4锛夛冀锛伙紙x锛2锛夛紙x锛3锛夛冀锛濓紙x²锛5x锛4锛夛紙x²锛5x锛6锛夛紳锛坸²锛5x锛5锛²锛1 锛漻4锛25x²锛25锛10x3锛10x²锛50x锛1 锛漻4锛10x3锛35x²锛50x锛24 ...
绛旓細浠栫殑绛旀鏄x鐨勪笁娆℃柟鍑忓幓涓墄鐨浜娆℃柟鍔犱笂2x.
绛旓細锛2锛夋牴鎹紙1锛夎绠楃殑缁撴灉锛屽紡瀛愮殑涓鑸舰寮忔槸锛坸+p锛夛紙x+q锛=x2+锛坧+q锛墄+pq锛庯紙3锛12=1脳12=2脳6=3脳4=锛-1锛壝楋紙-12锛=锛-2锛壝楋紙-6锛=锛-3锛壝楋紙-4锛夛紝鏁卪鐨勫彇鍊6涓紟瑙ｇ瓟锛氳В锛氾紙1锛夛紙x+1锛夛紙x+2锛=x2+3x+2锛锛坸-1锛夛紙x-2锛=x2-3x+2锛岋紙x-1锛夛紙x+2锛...
绛旓細瑙ｇ瓟濡備笅锛(x-1)(x-2)(x-3)(x+1)<0 楂樻鐨勭敤濂囩┛鍋跺洖娉曪紝杩欓噷鐨勫鍋舵槸鎸囨寚鏁 鍦ㄦ暟杞翠笂琛ㄧず闆剁偣x = -1锛寈 = 1锛寈 = 2锛寈 = 3 浠庡彸涓婅竟寮濮嬬敾鏇茬嚎锛屾寚鏁颁负濂囨暟鐨勫氨绌胯繃闆剁偣锛堣繖閲岄兘鏄鏁帮級鎵浠ヨВ涓猴紙2,3锛夆埅锛-1,1锛
绛旓細锛坸-1锛夛紙x-2锛澶т簬绛変簬0 x-1锛0鏃讹紝x-2涔熻锛0 x锛1锛寈锛2锛屽彇澶ф暟锛寈锛2 x-1锛0鏃讹紝x-2涔熻锛0 x锛1锛寈锛2锛屽彇灏忔暟锛寈锛1 鍥犱负绛変簬0锛屾墍浠 缁撴灉灏辨槸x鈮2鎴栬厁鈮1
绛旓細锛坸-1)(x-2)(x-3)(x-4)=锛坸-1)(x-4)(x-2)(x-3)=(x^2-5x+4)(x^2-5x+6)=(x^2-5x)^2+10(x^2-5x)+24 =x^4-10x^3+25x^2+10x^2-50x+24 =x^4-10x^3+35x^2-50x+24
