f（x）拔是什么意思 “f（x)”，“g（x)”是什么意思？
f(f(x))\u662f\u4ec0\u4e48\u610f\u601d?\u4ee5\u51fd\u6570f(x)\u505a\u4e3a\u81ea\u53d8\u91cf\u7684\u51fd\u6570f(f(x))
\u8868\u793a\u4e0d\u540c\u51fd\u6570\u3002
\u6bd4\u5982\u7b2c\u4e00\u4e2a\u51fd\u6570 f(x)=6x+7 \uff0c\u7b2c\u4e8c\u4e2a\u51fd\u6570 g(x)=7x-4\u3002
f(4) = 6*4+7\u3002
g(5) = 7*5-4\u3002
\u51fd\u6570\u7684\u5b9a\u4e49\uff1a\u7ed9\u5b9a\u4e00\u4e2a\u6570\u96c6A\uff0c\u5047\u8bbe\u5176\u4e2d\u7684\u5143\u7d20\u4e3ax\u3002\u73b0\u5bf9A\u4e2d\u7684\u5143\u7d20x\u65bd\u52a0\u5bf9\u5e94\u6cd5\u5219f\uff0c\u8bb0\u4f5cf\uff08x\uff09\uff0c\u5f97\u5230\u53e6\u4e00\u6570\u96c6B\u3002\u5047\u8bbeB\u4e2d\u7684\u5143\u7d20\u4e3ay\u3002\u5219y\u4e0ex\u4e4b\u95f4\u7684\u7b49\u91cf\u5173\u7cfb\u53ef\u4ee5\u7528y=f\uff08x\uff09\u8868\u793a\u3002
\u51fd\u6570\u6982\u5ff5\u542b\u6709\u4e09\u4e2a\u8981\u7d20\uff1a\u5b9a\u4e49\u57dfA\u3001\u503c\u57dfC\u548c\u5bf9\u5e94\u6cd5\u5219f\u3002\u5176\u4e2d\u6838\u5fc3\u662f\u5bf9\u5e94\u6cd5\u5219f\uff0c\u5b83\u662f\u51fd\u6570\u5173\u7cfb\u7684\u672c\u8d28\u7279\u5f81\u3002
\u6269\u5c55\u8d44\u6599\uff1a
\u5728\u4e00\u4e2a\u53d8\u5316\u8fc7\u7a0b\u4e2d\uff0c\u53d1\u751f\u53d8\u5316\u7684\u91cf\u53eb\u53d8\u91cf\uff08\u6570\u5b66\u4e2d\uff0c\u5e38\u5e38\u4e3ax\uff0c\u800cy\u5219\u968fx\u503c\u7684\u53d8\u5316\u800c\u53d8\u5316\uff09\uff0c\u6709\u4e9b\u6570\u503c\u662f\u4e0d\u968f\u53d8\u91cf\u800c\u6539\u53d8\u7684\uff0c\u6211\u4eec\u79f0\u5b83\u4eec\u4e3a\u5e38\u91cf\u3002
\u81ea\u53d8\u91cf\uff08\u51fd\u6570\uff09\uff1a\u4e00\u4e2a\u4e0e\u5b83\u91cf\u6709\u5173\u8054\u7684\u53d8\u91cf\uff0c\u8fd9\u4e00\u91cf\u4e2d\u7684\u4efb\u4f55\u4e00\u503c\u90fd\u80fd\u5728\u5b83\u91cf\u4e2d\u627e\u5230\u5bf9\u5e94\u7684\u56fa\u5b9a\u503c\u3002
\u56e0\u53d8\u91cf\uff08\u51fd\u6570\uff09\uff1a\u968f\u7740\u81ea\u53d8\u91cf\u7684\u53d8\u5316\u800c\u53d8\u5316\uff0c\u4e14\u81ea\u53d8\u91cf\u53d6\u552f\u4e00\u503c\u65f6\uff0c\u56e0\u53d8\u91cf\uff08\u51fd\u6570\uff09\u6709\u4e14\u53ea\u6709\u552f\u4e00\u503c\u4e0e\u5176\u76f8\u5bf9\u5e94\u3002
\u51fd\u6570\u503c\uff1a\u5728y\u662fx\u7684\u51fd\u6570\u4e2d\uff0cx\u786e\u5b9a\u4e00\u4e2a\u503c\uff0cy\u5c31\u968f\u4e4b\u786e\u5b9a\u4e00\u4e2a\u503c\uff0c\u5f53x\u53d6a\u65f6\uff0cy\u5c31\u968f\u4e4b\u786e\u5b9a\u4e3ab\uff0cb\u5c31\u53eb\u505aa\u7684\u51fd\u6570\u503c\u3002
函数的一种对应关系
绛旓細鑷彉閲忎负x鐨勫嚱鏁
绛旓細灏辨槸涓涓嚱鏁扮殑绗﹀彿鑰屽凡鍟婏紒瀹冨彲浠ュ弽鏄犺嚜鍙橀噺鏄皝 浠ュ悗杩樹細鐢ㄥ緢澶 姣斿g(x) h(x) 鍓嶉潰鐨勫瓧姣嶆病鍏崇郴鐨 鍙槸澶у涔犳儻鐢ㄨ繖鍑犱釜 浣犳槸涓嶆槸鍒氬杩欎釜鍟婏紵鍒氬鏈夌偣涓嶇悊瑙ｄ笉鐢ㄧ锛屼綘鎶婂畠鐪嬫垚浣犵啛鎮夌殑y灏卞ソ浜嗭紝瀛﹀埌鍚庨潰寰堝鏄撶悊瑙ｇ殑
绛旓細f(x)鍑芥暟鏄暟瀛︿腑涓绉嶅父瑙佺殑琛ㄧず鏂瑰紡銆傚畠琛ㄧず杈撳叆涓涓暟鍊紉锛岄氳繃涓瀹氱殑杩愮畻锛堝鍔犲噺涔橀櫎绛夛級锛屽緱鍑轰竴涓柊鐨勬暟鍊紋銆傝繖鏍风殑鍑芥暟鍙互鐢ㄦ潵鎻忚堪涓涓墿鐞嗚繃绋嬨佺粺璁℃暟鎹佺敋鑷虫槸绠楁硶绛夛紝鏄暟瀛︿腑鐨勫熀鏈蹇典箣涓銆傚湪鐜板疄鐢熸椿涓紝f(x)鍑芥暟搴旂敤骞挎硾锛屾瘮濡傝储鍔′細璁′腑鐨勬敹鏀绠楋紝宸ョ▼璁捐涓殑鍔涘璁＄畻锛屽尰瀛﹂鍩...
绛旓細鍑芥暟F(x)鏄瀹氫箟鍩烝鍒板煎煙B鐨勪竴绉嶇壒娈婄殑鏄犲皠銆傛槧灏凢锛欰鈥斺>B锛孎灏辨槸鍑芥暟涓夎绱犱腑鐨勫搴旀硶鍒欙紝瀹冨疄闄呬笂鏄竴绉嶇畻娉曘傛瘮濡侳(x)=2x+1锛孎灏辫〃绀簒鐨2鍊嶅啀鍔1杩欐牱涓绉嶇畻娉曘傚嚱鏁扮殑杩戜唬瀹氫箟鏄粰瀹氫竴涓暟闆咥锛屽亣璁惧叾涓殑鍏冪礌涓簒锛屽A涓殑鍏冪礌x鏂藉姞瀵瑰簲娉曞垯f锛岃浣f锛坸锛锛屽緱鍒板彟涓鏁伴泦B锛屽亣璁綛...
绛旓細f(x)鍙互琛ㄧず涓哄叧浜巟鐨勪竴涓嚱鏁帮紝x鏄繖涓嚱鏁扮殑鑷彉閲忥紝f(x)鏄杩欎釜鍑芥暟鐨勫簲鍙橀噺锛屽叾瀹炲氨绫讳技浜巠浜嗭紝姣斿璇磞=2x+1涔熷彲浠ュ啓鎴愭槸f锛坸锛=2x+1.瀹氫箟鍩熷氨鏄嚜鍙橀噺鍙互鍙栧埌鐨勫硷紝涔熷氨鏄痻鑳藉彇鍒扮殑鍊笺傚洜涓哄垎姣嶏紙杩欓亾棰樹腑鐨剎锛夌殑鏁颁笉鑳戒负0锛岄偅涔坸鐨勫彇鍊煎氨鏄痻鈮0鎴栬呭啓鎴愶紙璐熸棤绌峰ぇ锛0锛塙(0,姝...
绛旓細鏄x姹傚銆傚鏁版槸鍑芥暟鐨勫眬閮ㄦц川锛屼竴涓嚱鏁板湪鏌愪竴鐐圭殑瀵兼暟鎻忚堪浜嗚繖涓嚱鏁板湪杩欎竴鐐归檮杩戠殑鍙樺寲鐜囷紝琛ㄧずf(x)鐨勫鏁帮紝鍏朵腑鏄x姹傚銆傚鏋滃嚱鏁扮殑鑷彉閲忓拰鍙栧奸兘鏄疄鏁扮殑璇濓紝鍑芥暟鍦ㄦ煇涓鐐圭殑瀵兼暟灏辨槸璇ュ嚱鏁版墍浠ｈ〃鐨勬洸绾垮湪杩欎竴鐐逛笂鐨勫垏绾挎枩鐜囥傚鏁扮殑鏈川鏄氳繃鏋侀檺鐨勬蹇靛鍑芥暟杩涜灞閮ㄧ殑绾挎ч艰繎銆f(x)...
绛旓細杩欎釜璇存硶鏈夊澶勯敊璇細绗竴銆X鎷鐨勬柟宸槸蟽^2/n銆傜浜屻乆涓嶺鎷斾笉鐙珛锛屾柟宸笉鑳芥媶寮銆傜涓夈佸嵆浣胯兘鎷嗗紑锛孌(X-Y)=D(X)+D(Y)涓嶆槸鐩稿噺銆傦紙n-1锛塻^2/蟽^2鏈嶄粠围^2锛坣-1锛夊垎甯冿紝濡傛灉璁や负Xi-X鏈嶄粠鏍囧噯姝ｆ佸垎甯冪殑璇濓紝鑷敱搴﹀簲璇ユ敼鎴恘鑰屼笉鏄痭-1銆傚洜涓篠²=1/(n-1)鈭(Xi-X鎷)...
绛旓細f(x)鏄涓涓嚱鏁帮紝绫讳技浜庝竴娆″嚱鏁帮紝浜屾鍑芥暟閲岄潰鐨剏锛屽f(x)=4x+5鍜寉=4x+5 鏄竴涓鎰忔銆傛崲鍏冩硶锛氬彲浠ユ暣浣撴崲鍏冧篃鍙互鍗曚釜鎹㈠厓锛岄兘鏄负浜嗚绠楃畝渚裤備功涓婂簲璇ヨ鐨勫緢璇︾粏銆傝繖涓〃杩版竻妤氳鎵撳緢澶氬瓧銆傛湁浠涔涓嶄細鐨勫彲浠ョ涓嬭亰锛屾垜qq923620383.
绛旓細灏辨槸璇碮鏄叧浜庤嚜鍙橀噺X鐨勪竴涓嚱鏁般侳锛圶锛夊氨鏄寚浠涓鸿嚜鍙橀噺鐨勫嚱鏁帮紝F锛圶锛夋槸搴斿彉閲忋傝繖鏄〃杈緔鍜寈涔嬮棿鍏崇郴鐨勪竴涓紡瀛愩傛瘮濡侳锛圶锛=2X锛寉=f锛坸锛锛岄偅Y=2X锛屼袱涓槸涓涓鎰忔銆傚嚱鏁板湪鏁板涓负涓や笉涓虹┖闆嗙殑闆嗗悎闂寸殑涓绉嶅搴斿叧绯伙細杈撳叆鍊奸泦鍚堜腑鐨勬瘡椤瑰厓绱犵殕鑳藉搴斿敮涓涓椤硅緭鍑哄奸泦鍚堜腑鐨勫厓绱犮...
绛旓細f(x)鐩稿綋浜嶻=Kx+b涓殑Y銆俧(x)鍑芥暟涓瓁鐨勫间笉鍚屽氨鏈変笉鍚岀粨鏋溿傚懙鍛碉紝楂樹腑鏁板杩欓儴鍒嗘槸寰堥噸瑕佺殑銆傚ソ濂藉姫鍔涘惂锛
