1
21.2.2
閰嶆柟娉?/p>
绗?/p>
2
璇炬椂
鏁欏鍐呭
缁欏嚭閰嶆柟娉曠殑姒傚康锛岀劧鍚庤繍鐢ㄩ厤鏂规硶瑙ｄ竴鍏冧簩娆℃柟绋嬶紟
鏁欏鐩爣
浜嗚В閰嶆柟娉曠殑姒傚康锛屾帉鎻¤繍鐢ㄩ厤鏂规硶瑙ｄ竴鍏冧簩娆℃柟绋嬬殑姝ラ锛?/p>
閫氳繃澶嶄範涓婁竴鑺傝鐨勮В棰樻柟娉曪紝
缁欏嚭閰嶆柟娉曠殑姒傚康锛?/p>
鐒跺悗杩愮敤閰嶆柟娉曡В鍐充竴浜涘叿浣撻鐩紟
閲嶉毦鐐瑰叧閿?/p>
1
锛庨噸鐐癸細璁叉竻閰嶆柟娉曠殑瑙ｉ姝ラ锛?/p>
2
锛庨毦鐐逛笌鍏抽敭锛氭妸甯告暟椤圭Щ鍒版柟绋嬪彸杈瑰悗锛?/p>
鈥?/p>
涓よ竟鍔犱笂鐨勫父鏁版槸涓�娆￠」绯绘暟涓�鍗婄殑骞?/p>
鏂癸紟
鏁欏叿銆佸鍏峰噯澶?/p>
灏忛粦鏉?/p>
鏁欏杩囩▼
涓�銆佸涔犲紩鍏?/p>
锛堝鐢熸椿鍔級瑙ｄ笅鍒楁柟绋嬶細
锛?/p>
1
锛?/p>
x
2
-8x+7=0
锛?/p>
2
锛?/p>
x
2
+4x+1=0
鑰佸笀鐐硅瘎锛?/p>
鎴戜滑鍓嶄竴鑺傝锛?/p>
宸茬粡瀛︿範浜嗗浣曡В宸﹁竟鍚湁
x
鐨勫畬鍏ㄥ钩鏂瑰舰寮忥紝
鈥?/p>
鍙宠竟鏄潪
璐熸暟锛?/p>
涓嶅彲浠ョ洿鎺ュ紑鏂归檷娆¤В鏂圭▼鐨勮浆鍖栭棶棰橈紝
閭ｄ箞杩欎袱閬撻涔熷彲浠ョ敤涓婇潰鐨勬柟娉曡繘琛岃В棰橈紟
瑙ｏ細
锛?/p>
1
锛?/p>
x
2
-8x+
锛?/p>
-4
锛?/p>
2
+7-
锛?/p>
-4
锛?/p>
2
=0
锛?/p>
x-4
锛?/p>
2
=9
x-4=
卤
3
鍗?/p>
x
1
=7
锛?/p>
x
2
=1
锛?/p>
2
锛?/p>
x
2
+4x=-1
x
2
+4x+2
2
=-1+2
2
锛?/p>
x+2
锛?/p>
2
=3
鍗?/p>
x+2=
卤
3
x
1
=
3
-2
锛?/p>
x
2
=-
3
-2
浜屻�佹帰绱㈡柊鐭?/p>
鍍忎笂闈㈢殑瑙ｉ鏂规硶锛岄�氳繃閰嶆垚瀹屽叏骞虫柟褰㈠紡鏉ヨВ涓�鍏冧簩娆℃柟绋嬬殑鏂规硶锛屽彨閰嶆柟娉曪紟
鍙互鐪嬪嚭锛岄厤鏂规硶鏄负浜嗛檷娆★紝鎶婁竴涓竴鍏冧簩娆℃柟绋嬭浆鍖栦负涓や釜涓�鍏冧竴娆℃柟绋嬫潵瑙ｏ紟
渚?/p>
1
锛庤В涓嬪垪鏂圭▼
锛?/p>
1
锛?/p>
x
2
+6x+5=0
锛?/p>
2
锛?/p>
2x
2
+6x-2=0
锛?/p>
3
锛?/p>
锛?/p>
1+x
锛?/p>
2
+2
锛?/p>
1+x
锛?/p>
-4=0
鍒嗘瀽锛?/p>
鎴戜滑宸茬粡浠嬬粛浜嗛厤鏂规硶锛?/p>
鍥犳锛屾垜浠В杩欎簺鏂圭▼灏卞彲浠ョ敤閰嶆柟娉曟潵瀹屾垚锛屽嵆閰嶄竴
涓惈鏈?/p>
x
鐨勫畬鍏ㄥ钩鏂癸紟
瑙ｏ細
锛?/p>
1
锛夌Щ椤癸紝寰楋細
x
2
+6x=-5
閰嶆柟锛?/p>
x
2
+6x+3
2
=-5+3
2
锛?/p>
x+3
锛?/p>
2
=4
鐢辨鍙緱锛?/p>
x+3=
卤
2
锛屽嵆
x
1
=-1
锛?/p>
x
2
=-5
锛?/p>
2
锛夌Щ椤癸紝寰楋細
2x
2
+6x=-2
浜屾椤圭郴鏁板寲涓?/p>
1
锛屽緱锛?/p>
x
2
+3x=-1
閰嶆柟
x
2
+3x+
锛?
3
2
锛?/p>
2
=-1+
锛?/p>
3
2
锛?/p>
2
锛?/p>
x+
3
2
锛?/p>
2
=
5
4
鐢辨鍙緱
x+
3
2
=
卤
5
2
锛屽嵆
x
1
=
5
2
-
3
2
锛?/p>
x
2
=-
5
2
-
3
2