求斜率k的公式？谢谢
K=tanα（α是倾斜角），k=（y2-y1）/（x2-x1）绛旓細鏂滅巼k鐨勫叕寮鏄細k = 鈻硑 / 鈻硏銆傛枩鐜囪〃绀轰竴鏉＄洿绾跨浉瀵逛簬姘村钩杞村炬枩鐨勭▼搴︺傚湪璁稿鏁板搴旂敤涓紝灏ゅ叾鏄湪瑙ｆ瀽鍑犱綍涓紝鏂滅巼鏄竴涓牳蹇冩蹇点傛枩鐜囩殑鍏紡鏄氳繃涓ょ偣闂寸殑绾靛潗鏍囧樊鍜屾í鍧愭爣宸殑姣斿兼潵璁＄畻鐨勩傝繖涓叕寮忓弽鏄犱簡鐩寸嚎鐨勫彉鍖栫巼锛屼篃灏辨槸闅忕潃妯潗鏍囩殑鍙樺寲锛岀旱鍧愭爣鏄浣曞彉鍖栫殑銆傛枩鐜噆鐨勮绠楀熀浜庝互涓...
绛旓細鏂滅巼杩樻湁鍏朵粬鍏紡锛屼緥濡傚湪鐩寸嚎鐨勬枩鎴紡y=kx+b涓紝鏂滅巼k鐨璁＄畻涓庢埅璺漛鐙珛銆傚綋鐩寸嚎鏂滅巼瀛樺湪鏃讹紝鐐规枩寮忓叕寮忎负y-y1=k(x-x1)锛屽弽鏄犲嚭鐩寸嚎閫氳繃鐐癸紙x1, y1锛夋椂鐨勬枩鐜囥傚浜庡嚱鏁颁笂浠讳竴鐐癸紝鍏舵枩鐜囩瓑浜庤鐐瑰垏绾夸笌x杞存鏂瑰悜鐨勬鍒囧硷紝鍗砶=tan伪锛岃繖浣撶幇浜嗗鏁扮殑鍑犱綍鎰忎箟锛屽嵆鎻忚堪鏇茬嚎鍦ㄨ鐐圭殑鍒囩嚎鍊炬枩...
绛旓細褰撶洿绾縇鐨勬枩鐜囧瓨鍦ㄦ椂锛岀偣鏂滃紡y2鈥攜1=k(X2鈥擷1锛夛紝褰撶洿绾縇鍦ㄤ袱鍧愭爣杞翠笂瀛樺湪闈為浂鎴窛鏃讹紝鏈夋埅璺濆紡X/a+y/b=1 瀵逛簬浠绘剰鍑芥暟涓婁换鎰忎竴鐐癸紝鍏舵枩鐜囩瓑浜庡叾鍒囩嚎涓巟杞存鏂瑰悜鐨勫す瑙掞紝鍗硉an伪 鏂滅巼璁＄畻锛歛x+by+c=0涓紝k=-a/b.鐩寸嚎鏂滅巼鍏紡:k=(y2-y1)/(x2-x1)涓ゆ潯鍨傜洿鐩镐氦鐩寸嚎鐨勬枩鐜囩浉涔樼Н涓-...
绛旓細鏂滅巼璁＄畻锛歛x+by+c=0涓紝k=-a/b銆傜洿绾鏂滅巼鍏紡:k=(y2-y1)/(x2-x1)涓ゆ潯鍨傜洿鐩镐氦鐩寸嚎鐨勬枩鐜囩浉涔樼Н涓-1锛歬1*k2=-1銆傛洸绾縴=f(x)鍦ㄧ偣(x1,f(x1))澶勭殑鏂滅巼灏辨槸鍑芥暟f(x)鍦ㄧ偣x1澶勭殑瀵兼暟 褰撶洿绾縇鐨勬枩鐜囧瓨鍦ㄦ椂锛屾枩鎴紡y=kx+b褰搆=0鏃 y=b锛涘綋鐩寸嚎L鐨勬枩鐜囧瓨鍦ㄦ椂锛岀偣鏂滃紡y2鈥攜1=k...
绛旓細鐩寸嚎鏂滅巼鍏紡锛k=(y2-y1)/(x2-x1)锛涘鏋滅洿绾夸笌x杞村瀭鐩达紝鐩磋鐨勬鍒囧兼棤绌峰ぇ锛屾晠姝ょ洿绾夸笉瀛樺湪鏂滅巼銆傚綋鐩寸嚎L鐨勬枩鐜囧瓨鍦ㄦ椂锛屽浜庝竴娆″嚱鏁皔=kx+b锛堟枩鎴紡锛夛紝k鍗宠鍑芥暟鍥惧儚(鐩寸嚎)鐨勬枩鐜囥傚綋鐩寸嚎L鐨勬枩鐜囦笉瀛樺湪鏃讹紝鏂滄埅寮弝=kx+b銆傚綋k=0鏃 y=b褰撶洿绾縇鐨勬枩鐜囧瓨鍦ㄦ椂锛岀偣鏂滃紡y2鈥攜1=k(X2鈥...
绛旓細鐩寸嚎鏂滅巼鍏紡锛k=(y2-y1)/(x2-x1)锛涘鏋滅洿绾夸笌x杞村瀭鐩达紝鐩磋鐨勬鍒囧兼棤绌峰ぇ锛屾晠姝ょ洿绾夸笉瀛樺湪鏂滅巼銆傚綋鐩寸嚎L鐨勬枩鐜囧瓨鍦ㄦ椂锛屽浜庝竴娆″嚱鏁皔=kx+b锛堟枩鎴紡锛夛紝k鍗宠鍑芥暟鍥惧儚(鐩寸嚎)鐨勬枩鐜囥傜洿绾挎枩鐜囩畝浠嬶細鐩寸嚎鏂滅巼锛屽張绉颁负瑙掔郴鏁帮紝瀹冭〃绀虹殑鏄竴鏉＄洿绾跨浉瀵逛簬妯酱鐨勫炬枩绋嬪害銆傚綋鐩寸嚎鏂滅巼鐨缁濆鍊艰秺澶ф椂...
绛旓細瀵逛簬鐩寸嚎涓鑸紡 Ax+By+C=0 锛鏂滅巼鍏紡涓猴細k=-a/b銆姹傛枩鐜姝ラ涓猴細瀵逛簬鐩寸嚎鏂圭▼x-2y+3=0 锛1锛夋妸y鍐欏湪绛夊彿宸﹁竟,x鍜屽父鏁板啓鍦ㄥ彸杈癸細2y=x+3.锛2锛夋妸y鐨勭郴鏁板寲涓1锛歽=0.5x+1.5.锛3锛夋鏃秞鐨勭郴鏁板嵆涓烘枩鐜囷細k=0.5 -b/c鏄鐩寸嚎鍦▂鍧愭爣杞翠笂浜ょ偣鐨勭旱鍧愭爣锛-c/a 鏄洿绾垮湪x鍧愭爣涓...
绛旓細4銆佺洿绾胯В鏋鍏紡銆傛垜浠煡閬撶洿绾胯В鏋愬紡鐨勪竴鑸紡Ax+By+C=0鏃讹紝鎴戜滑鍙互姹傚緱鐩寸嚎鐨鏂滅巼k=-A/B銆傚彧瑕佸皢涓鑸紡鍖栦负鐐规埅寮弝=-Ax/B-C/B锛屽氨鍙互寰楀埌杩欎釜鍏紡浜嗐5銆佹枩鐜囩殑鏈川鍏紡銆傛渶鍚庝竴涓叕寮忔渶鑳戒綋鐜版枩鐜囩殑鏈川锛屽畠鎸囩殑鏄洿绾夸笌x杞寸殑鍙充笂澶硅鐨勬鍒囧笺傚綋鐩寸嚎涓巟杞寸殑鍙充笂澶硅涓何告椂锛宬=tan...
绛旓細鏂滅巼绛変簬鍑芥暟f(x)鐨勫鏁帮紝鍗冲鍑芥暟f(x)姹傚锛鏂滅巼k=f´(x)銆
绛旓細K=tan伪锛埼辨槸鍊炬枩瑙掞級锛k=锛坹2-y1锛/锛坸2-x1锛
