职高一数学题
\u804c\u9ad8\u6570\u5b66\u9898\u2014\u2014\u5e94\u7528\u98981.(1+30\uff09\u00d730/2=465
2.\u672c\u606f=\uff081+12\u00d7\u5b58\u671f\u5e74\u6570\uff09\u00d7\uff08\u5e74\u5229\u7387\u00d7\u5b58\u671f\u5e74\u6570\uff09/2\u00d7\u6708\u5b58\u91d1\u989d+12\u00d7\u5b58\u671f\u5e74\u6570\u00d7\u6708\u5b58\u91d1\u989d
\u6240\u4ee5
\u672c\u606f=\uff081+12\u00d71)\u00d7(1.71\uff05\u00d71)/2 \u00d7200+12\u00d71\u00d7200=2422.23
\u77e5\u8bc6\u6269\u5145:
\u5229\u606f\u8ba1\u7b97\u516c\u5f0f\u4e00
\u3000\u3000\u96f6\u5b58\u6574\u53d6\u5229\u606f\u8ba1\u7b97\u516c\u5f0f\u662f\uff1a\u5229\u606f=\u6708\u5b58\u91d1\u989d\u00d7\u7d2f\u8ba1\u6708\u79ef\u6570\u00d7\u6708\u5229\u7387\u3002
\u3000\u3000\u5176\u4e2d\u7d2f\u8ba1\u6708\u79ef\u6570=\uff08\u5b58\u5165\u6b21\u6570+1\uff09\u00f72\u00d7\u5b58\u5165\u6b21\u6570\u3002\u636e\u6b64\u63a8\u7b97\u4e00\u5e74\u671f\u7684\u7d2f\u8ba1\u6708\u79ef\u6570\u4e3a\uff0812+1\uff09\u00f72\u00d712=78\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c\u4e09\u5e74\u671f\u3001\u4e94\u5e74\u671f\u7684\u7d2f\u8ba1\u6708\u79ef\u6570\u5206\u522b\u4e3a666\u548c1830\u3002\u50a8\u6237\u53ea\u9700\u8bb0\u4f4f\u8fd9\u51e0\u4e2a\u5e38\u6570\u5c31\u53ef\u6309\u516c\u5f0f\u8ba1\u7b97\u51fa\u96f6\u5b58\u6574\u53d6\u50a8\u84c4\u5229\u606f\u3002\u8be5\u8ba1\u7b97\u516c\u5f0f\u53ea\u9002\u5408\u5321\u7b97\uff0c\u5b9e\u9645\u5e94\u4ed8\u5229\u606f\u6309\u5ba2\u6237\u6bcf\u6708\u7684\u5b58\u6b3e\u65e5\u671f\u63d0\u524d\u6216\u9519\u540e\u6709\u5173\uff0c\u8be5\u5e94\u5f97\u5229\u606f\u53ea\u662f\u9488\u5bf9\u6bcf\u6708\u5b58\u6b3e\u65e5\u671f\u4e0d\u53d8\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u3002
\u5229\u606f\u548c\u63a8\u5bfc\u8fc7\u7a0b
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\u3000\u3000\u5012\u6570\u7b2c1\u6708\u5229\u606f\uff08\u5355\u4f4d\u4e3a\u5143\uff09=\u6708\u5b58\u91d1\u989d\u00d7\u5e74\u5229\u7387\u00f712
\u3000\u3000\u5012\u6570\u7b2c2\u6708\u5229\u606f=2\u00d7\u6708\u5b58\u91d1\u989d\u00d7\u5e74\u5229\u7387\u00f712
\u3000\u3000\u2026\u2026
\u3000\u3000\u5012\u6570\u7b2cn\uff08n=12\u00d7\u5b58\u671f\u5e74\u6570\uff09\u6708\u5229\u606f=n\u00d7\u6708\u5b58\u91d1\u989d\u00d7\u5e74\u5229\u7387\u00f712=12\u00d7\u5b58\u671f\u5e74\u6570\u00d7\u6708\u5b58\u91d1\u989d\u00d7\u5e74\u5229\u7387\u00f712
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\u3000\u3000\u5229\u606f\u548c=\u6708\u5b58\u91d1\u989d\u00d7\u5e74\u5229\u7387\u00f712\u00d7\uff081+2+3+\u2026+12\u00d7\u5b58\u671f\u5e74\u6570\uff09=\u6708\u5b58\u91d1\u989d\u00d7\u5e74\u5229\u7387\u00f712\u00d7[\uff081+12\u00d7\u5b58\u671f\u5e74\u6570\uff09\u00d712\u00d7\u5b58\u671f\u5e74\u6570\u00f72]=\uff080.5+6\u00d7\u5b58\u671f\u5e74\u6570\uff09\u00d7\uff08\u5e74\u5229\u7387\u00d7\u5b58\u671f\u5e74\u6570\uff09\u00d7\u6708\u5b58\u91d1\u989d
\u5229\u606f\u8ba1\u7b97\u516c\u5f0f\u4e8c
\u3000\u3000\u5f97\u96f6\u5b58\u6574\u53d6\u603b\u5229\u606f\u516c\u5f0f\uff1a
\u3000\u3000\u5229\u606f\u548c=\uff081+12\u00d7\u5b58\u671f\u5e74\u6570\uff09\u00d7\uff08\u5e74\u5229\u7387\u00d7\u5b58\u671f\u5e74\u6570\uff09\u00d7\u6708\u5b58\u91d1\u989d/2
\u3000\u3000\u800c\u672c\u606f\u516c\u5f0f\u4e3a\uff1a
\u3000\u3000\u672c\u606f=\uff081+12\u00d7\u5b58\u671f\u5e74\u6570\uff09\u00d7\uff08\u5e74\u5229\u7387\u00d7\u5b58\u671f\u5e74\u6570\uff09/2\u00d7\u6708\u5b58\u91d1\u989d+12\u00d7\u5b58\u671f\u5e74\u6570\u00d7\u6708\u5b58\u91d1\u989d
(3^x)^2-12*3^x+27=0
(3^x-3)(3^x-9)=0
∴3^x=3或9，x=1或3
∴x=1或x=3
9^x-4*3^(x+1)+27=0
(3^x)^2-12*3^x+27=0
(3^x-3)(3^x-9)=0
∴3^x=3或9，x=1或2
∴x=1或x=2
绛旓細1.杩欎袱绉嶅懡棰橈細鍘熷懡棰橈細鑻鍒橯锛涢嗗惁鍛介锛氳嫢銆孮 鍒欍孭锛涒滃師鍛介锛氳嫢P鍒橯鈥 鈥滈嗗惁鍛介锛氳嫢銆孮 鍒欍孭鈥濈湡锛1锛 鐪燂紙1锛夊亣锛0锛 鍋囷紙0锛夆滃鏋淧,鍒橯鈥濆拰鈥滃鏋溿孮锛屽垯銆孭鈥濅袱涓懡棰樻槸鍚岀湡鍚屽亣 锛屼緥濡傦細P: a=0 锛決锛歛b=0 锛涘垯鍘熷懡棰樷滆嫢a=0锛屽垯ab=0鈥濇槸鐪熷懡...
绛旓細搴曢潰涓杈归暱涓簒 搴曢潰绉槸8/2=4骞虫柟绫 鎵浠ュ簳闈㈠彟涓鏉¤竟闀挎槸4/x 渚ч潰闈㈢Н=x*2*2+4*2*2/x=4x+16/x 鎬婚犱环Y=(4x+16/x)*80+4*120=320x+1280/x+480
绛旓細绛夋瘮 a2²=a1a3 a1a2a3=216 鎵浠2³=216 a2=6 a1=6/q,a3=6q 鍒6/q+6+6q=26 涓よ竟涔榪 3q²-10q+3=0 (3q-1)(q-3)=0 q=1/3,q=3 鎵浠ユ槸2,6,18鎴18,6,2
绛旓細褰搙鍦ㄧ涓璞￠檺锛宻inx鏄鍊硷紝cosx鏄鍊硷紝tanx鏄鍊笺傚師寮=1+1+1=3 褰搙鍦ㄧ浜岃薄闄愶紝sinx鏄鍊硷紝cosx鏄礋鍊硷紝tanx鏄礋鍊笺傚師寮=1-1-1=-1 褰搙鍦ㄧ涓夎薄闄愶紝sinx鏄礋鍊硷紝cosx鏄礋鍊硷紝tanx鏄鍊笺傚師寮=-1-1+1=-1 褰搙鍦ㄧ鍥涜薄闄愶紝sinx鏄礋鍊硷紝cosx鏄鍊硷紝tanx鏄礋鍊笺傚師寮=-1+1-1=...
绛旓細璁惧渾鏂圭▼涓(x-a)²+(y-b)²=r²杩囧垏鐐,涓斿瀭鐩翠簬鐩寸嚎3x+4y-2=0鐨勭洿绾夸负y+1=(4/3)(x-2),鍗4x-3y-11=0 鍦嗗績(a,b)鍦ㄦ鐩寸嚎涓,涓斿埌鐐筆鐨勮窛绂籨=r,鍗筹細鈶4a-3b-11=0,鈶3a-4b-2|/鈭(3²+4²)=r 灏唝=0浠ｅ叆鍦嗘柟绋,寰楋細(x-a)²+b&#...
绛旓細1. M鈭㎞=M, M鈭狽=N 2. 18 (鍑芥暟瀵圭О杞翠负 x=6 锛屾湁3涓牴锛屽垯鍏朵腑蹇呮湁涓鏍规槸6锛屽彟澶栦袱鏍瑰拰涓12锛3. 0 锛堢敱F(X)=a+(2/x+b) 姹傚嚭F-1锛坸锛夛紝瀵规瘮寰梐=-b锛4. 鏈澶у硷細2 鏈灏忓硷細0. 锛堝y鍏充簬x姹傚寰 y'=锛-6x^2+54)/(9+x^2)^2 ,浠'=0 寰 x=3鍜-3锛5....
绛旓細浣犲ソ锛屽寲鎴愭渶绠寮忥紝-13n+2n^2-2n=50 2n^-15n-50=0鎺ㄥ嚭(n-10)(2n-5)=0寰楋紝n=10鎴杗=5/2.绁濇洿涓婁竴灞傛ゼ锛
绛旓細tan45掳=1 (1+tan15掳)/(1-tan15掳)=(tan45掳+tan15掳)/-(1-tan15掳tan45掳)=-tan(45掳+15掳)=-tan60掳 =-鈭3
绛旓細1銆傘傘7涓紝12 13 14 123 124 134 1234 璁＄畻杩囩▼c11c31+c11c32+c11c33=7 2.銆傘傘俢41+c42+c43=14 3.銆傘傘俴=5锛岋紙x²+4x-5锛夛紙x²-6x+k锛=0鍗虫槸x²+4x-5=0鎴杧²-6x+k=0锛屽墠闈㈣В寰梮=1鎴-5銆傚張鍥犱负锝-5,1,5锝濇墍浠杩樺簲鏈変竴...
绛旓細f(2)=2/(2a+b)=1 鈭2a+b=2 b=2-2a f(x)=x/(ax+b)=x 鈭(ax+b)x=x 鈭磝=0 鎴朼x+b=1 x=(1-b)/a=1+1/a f(1+1/a)=(1+1/a)/锛籥(1+1/a)+2-2a锛=1+1/a (1+1/a)/锛籥(1+1/a)+2-2a锛=1+1/a 1+1/a=0 a=-1 b=2-2a=4 鎴+1+...
