初中數學微課腳本

Ⅰ 鍒濅腑鏁板﹀井璇炬暀妗

銆銆浣滀負涓鍚嶅垵涓鏁板﹁佸笀錛岃佹暀浼氬︾敓鎶婂井璇劇殑鏁板︾煡璇嗚繍鐢ㄥ埌鐢熸椿涓銆傛垜鏁寸悊鐨勮傛暀妗堟ā鏉匡紝甯屾湜澶у跺枩嬈錛屼粎渚涘弬鑰冨摝銆

銆 銆鏁欏﹁儗鏅錛

銆銆閰嶆柟娉曟槸鍒濅腑鏁板︿竴縐嶅緢閲嶈佺殑鎬濇兂鏂規硶錛屽叿鏈変婦瓚寵交閲嶇殑浣滅敤鍜屽湴浣嶏紝鍦ㄤ腑鑰冧腑棰戦戝嚭鐜幫紝鏄鍒濅腑鐢熷繀澶囩殑涓縐嶆暟瀛﹁兘鍔涖傚湪瑙ｄ竴鍏冧簩嬈℃柟紼嬶紝浜屾″嚱鏁幫紝鍥犲紡鍒嗚В,瑙ｇ壒孌婃柟紼嬶紝鏈夊叧鏈澶ф垨鏈灝忓奸樼洰錛屼唬鏁板紡奼傚間腑鏈夊箍娉涘簲鐢ㄣ

銆 銆鏁欏︾洰鏍囷細

銆銆1銆佷簡瑙ｉ厤鏂規硶鐨勫畾涔;

銆銆2銆佺悊瑙ｅ苟鎺屾彙閰嶆柟娉曠殑搴旂敤;

銆銆 鏁欏︽柟娉曪細

銆銆瑙嗛戞暀瀛︺佷緥棰樿茶В

銆 銆鏁欏﹁繃紼嬶細

銆銆 涓銆 娓╂晠鐭ユ柊

銆銆浠涔堟槸閰嶆柟娉?

銆銆閰嶆柟娉曟槸鎸囬氳繃閰嶃佸噾絳夋墜孌靛緱鍒板畬鍏ㄥ鉤鏂瑰艦寮忥紝鍐嶅埄鐢ㄥ畬鍏ㄥ鉤鏂歸」鏄闈炶礋鏁扮瓑鎬ц川錛岃揪鍒板炲姞棰樼洰鐨勬潯浠剁瓑鐩鐨勩

銆銆 浜屻 瀛︿範鏂扮煡

銆銆灞曠ず閰嶆柟娉曠殑鍥涗釜鏂歸潰搴旂敤錛

銆銆(涓)銆侀厤鏂規硶瑙ｄ竴鍏冧簩嬈℃柟紼

銆銆渚1錛氱敤閰嶆柟娉曡В鏂圭▼3x2+8x-3=0.

銆銆姝ラわ細

銆銆1.鍖1:鎶婁簩嬈￠」緋繪暟鍖栦負1;

銆銆2.縐婚」:鎶婂父鏁伴」縐誨埌鏂圭▼鐨勫彸杈;

銆銆3.閰嶆柟:鏂圭▼涓よ竟閮藉姞涓婁竴嬈￠」緋繪暟緇濆瑰間竴鍗婄殑騫蟲柟;

銆銆4.鍙樺艦:鏂圭▼宸﹁竟鍒嗚В鍥犲紡,鍙寵竟鍚堝苟鍚岀被;

銆銆5.寮鏂:鏍規嵁騫蟲柟鏍規剰涔,鏂圭▼涓よ竟寮騫蟲柟;

銆銆6.奼傝В:瑙ｄ竴鍏冧竴嬈℃柟紼;

銆銆7.瀹氳В:鍐欏嚭鍘熸柟紼嬬殑瑙.

銆銆閲嶇偣璁茶В絎涓鍜岀涓夋ラ

銆銆(浜)銆侀厤鏂規硶奼備簩嬈″嚱鏁扮殑鏈鍊

銆銆渚2錛氬凡鐭x鏄瀹炴暟錛屾眰y=x2-6x+10鐨勬渶鍊.

銆銆鍒嗘瀽錛氶厤鏂規垚欏剁偣寮忓嵆鍙奼傚嚭鍑芥暟鏈鍊.

銆銆(涓)銆侀厤鏂規硶奼備唬鏁板紡鐨勬渶鍊

銆銆渚3:璇佹槑鏃犺簒涓轟綍瀹炴暟錛屼唬鏁板紡2x2-3x+10鐨勫兼亽澶т簬闆.

銆銆鍒嗘瀽錛氬皢榪欎釜浜屾′笁欏瑰紡閰嶆柟錛屽氨鍙鍒ゆ柇鍏舵渶鍊兼槸浠涔.

銆銆鎺ョ潃鎻愰棶錛氫綘鑳芥眰鍑烘や唬鏁板紡鐨勬渶鍊煎悧?

銆銆(鍥)銆侀厤鏂規硶瑙ｇ壒孌婃柟紼

銆銆渚4錛氬凡鐭ユ柟紼媥2 -10x +y2-8y+41=0.奼倄+y鍊.

銆銆鍒嗘瀽錛氬厛瑙ｆ柟紼嬫眰鍑簒鍜寉鍊礆紝灝41鎷嗘垚25+16,絳夊紡宸﹁竟閰嶆柟鍑戞垚涓ゅ畬鍏ㄥ鉤鏂瑰紡錛屼簬鏄鍙鍖栦負涓ゆ暟騫蟲柟鍜屼負0鐨.寮忓瓙錛屼粠鑰屽垎鍒奼傚嚭x銆亂鐨勫.

銆 銆涓夈 鍥炲懗鏃犵┓

銆銆1銆侀厤鏂規硶鐨勫簲鐢

銆銆涓銆侀厤鏂規硶瑙ｄ竴鍏冧簩嬈℃柟紼

銆銆浜屻侀厤鏂規硶奼備簩嬈″嚱鏁扮殑鏈鍊

銆銆涓夈侀厤鏂規硶奼備唬鏁板紡鐨勬渶鍊

銆銆鍥涖侀厤鏂規硶瑙ｇ壒孌婃柟紼

銆銆2銆佹濊冿細涓婇潰閰嶆柟娉曠殑鍥涗釜搴旂敤涓錛屽摢浜涙槸鈥滈厤鈥濓紝鍝浜涙槸鈥滃噾鈥濆憿?

銆銆絎涓銆佷簩銆佷笁鏂歸潰鍏抽敭鍦ㄢ滈厤鈥濓紝絎鍥涙柟闈㈠叧閿鍦ㄢ滃噾鈥.

銆銆鍥涖佷綔涓氳捐★細瑙佽繘闃剁粌涔

銆銆 浜斻佹暀瀛︽葷粨錛

銆銆閰嶆柟娉曞湪鍒濅腑鏁板︿腑鍗犳湁闈炲父閲嶈佺殑鍦頒綅錛屾槸鎮掔瓑鍙樺艦鐨勯噸瑕佹墜孌碉紝鏄鐮旂┒鐩哥瓑鍏崇郴錛岃ㄨ轟笉絳夊叧緋葷殑甯哥敤鎶宸э紝鏄鎸栨帢棰樼洰褰撲腑闅愬惈鏉′歡鐨勬湁鍔涘伐鍏鳳紝鍚屽︿滑涓瀹氳佹妸瀹冨﹀ソ銆