职高数学题，跪求答案，谢谢！
\u804c\u9ad8\u6570\u5b66\u98983x^2-10x+k=0
\u67092\u4e0d\u7b49\u6839
\u521910^2-4*3*k\uff1e0
\u6240\u4ee5k\uff1c25/3
\u56e0\u4e3ax1+x2\uff1d10/3\uff1e0
\u6240\u4ee5\u53ea\u8981x1x2\uff1e0\u5373\u53ef
x1*x2=k\uff1e0
\u6240\u4ee5\u662f0\uff1ck\uff1c25/3
1. M\u2229N=M, M\u222aN=N
2. 18 (\u51fd\u6570\u5bf9\u79f0\u8f74\u4e3a x=6 \uff0c\u67093\u4e2a\u6839\uff0c\u5219\u5176\u4e2d\u5fc5\u6709\u4e00\u6839\u662f6\uff0c\u53e6\u5916\u4e24\u6839\u548c\u4e3a12\uff09
3. 0 \uff08\u7531F(X)=a+(2/x+b) \u6c42\u51faF-1\uff08x\uff09\uff0c\u5bf9\u6bd4\u5f97a=-b\uff09
4. \u6700\u5927\u503c\uff1a2 \u6700\u5c0f\u503c\uff1a0. \uff08\u5bf9y\u5173\u4e8ex\u6c42\u5bfc\u5f97 y'=\uff08-6x^2+54)/(9+x^2)^2 ,\u4ee4y'=0 \u5f97 x=3\u548c-3\uff09
5. \uff08\u662fy=5x^2+1\u5427\uff09\u56fe\u50cf\u5173\u4e8ey\u8f74\u5bf9\u79f0\uff0c\u6700\u5c0f\u503c\u4e3a1\uff0c\u5f00\u53e3\u5411\u4e0a\u7684\u629b\u7269\u7ebf
6 .\u5982\u56fe
子集：集合A范围大于或等于集合B，B是A的子集；真子集：集合A范围比B大，B是A的真子集
举你的题例来说明
如集合A={s,t} 则A的子集有：空集，{s}，{t}，{s,t}
而A的真子集有：空集，{s}，{t}
子集 {s，t} {s} {t} ∅
真子集 {s} {t} ∅
绛旓細锛1锛夎瘉鏄庯細鈭碘柍ABC鏄瓑杈逛笁瑙掑舰 鈭粹垹ABQ=鈭燙AP锛孉B=CA锛屽張鈭电偣P銆丵杩愬姩閫熷害鐩稿悓锛屸埓AP=BQ锛屽湪鈻矨BQ涓庘柍CAP涓紝鈭 AB=CA 鈭燗BQ=鈭燙AP AP=BQ 锛屸埓鈻矨BQ鈮屸柍CAP锛圫AS锛夛紱锛2锛夎В锛氱偣P銆丵鍦ㄨ繍鍔ㄧ殑杩囩▼涓紝鈭燪MC涓嶅彉锛庣悊鐢憋細鈭碘柍ABQ鈮屸柍CAP锛屸埓鈭燘AQ=鈭燗CP锛屸埖鈭燪MC=鈭燗CP+鈭燤AC锛屸埓...
绛旓細30=50k锛30锛50k1+b 38锛60k1+b 瑙ｅ緱锛歬=0.6锛宬1锛0.8 b锛−10 鈭磞=0.6x(0鈮鈮50)0.8x−10(x锛50)褰搚=24鏃讹紝24=0.6x锛岃В寰梮=40锛涘綋y=39.6鏃讹紝39.6=0.8x-10锛岃В寰楋細x=62锛庢晠绛旀涓猴細40搴︽垨62锛庣敳鐨勯熷害锛1/4/12=1/48銆備竴榻愮殑閫熷害锛(3/4涓1/4)...
绛旓細1.锛4/1鈫掆懁锛夆旓紙5/1鈫掆懀锛=锛4/1+5/1+6/1+7/1+8/1锛-锛5/1+6/1+7/1+8/1锛=4/1 2.15/7鈫愨啋13/5=195/12 3.(1)3鈼庯紙2鈼4锛=3鈼庛愶紙2+1锛*4/1銆=3鈼4/3=锛3+1锛*4/3/1=3/16 锛2锛墄鈼4=锛坸+1锛*4/1=1.35锛岃В寰梮=4.4 4.锛坸鈼巟锛夆棊(x+1...
绛旓細浜 r=2/2=1 R=1+1=2 S澶-s灏=3.14R^2-3.14r^2 鍏 1.30/(210-30) 2.40x锛1+50%) 3.5/8闄や互5/6x60 4.30000+30000x3x4.65
绛旓細100<x=5*7*n+3<200 n=3 x=108
绛旓細(a-2)/(a²-1)梅(a-1-(2a-1)/(a+1))=(a-2)/(a+1)(a-1)梅(a²-1-2a+1)/(a+1)=(a-2)/(a+1)(a-1)梅a(a-2)/(a+1)=(a-2)/(a+1)(a-1)梅a(a-2)/(a+1)=1/a(a-1)=1/(a²-a)=1/6 ...
绛旓細閮ㄥ垎澶栧叾浣欏潎鏄竴娆 鎵浠ヨ嫢璁╄鍑芥暟涓轰竴娆″嚱鏁帮紝闇瑕佹弧瓒砿^2-8=1 瑙ｅ緱m=卤3 鈭村垎绫昏璁衡憼褰搈=3鏃讹紝鍘熷紡=2 涓哄父鏁板嚱鏁帮紝涓嶆槸涓娆″嚱鏁 鎵浠=3鑸嶅幓 鈶″綋m=-3鏃讹紝鍘熷紡=-6x+5-锛-3锛=-6x+8 鏄竴娆″嚱鏁帮紝鍥惧儚濡備笅 鈭寸患涓婃墍杩版弧瓒抽鎰忔潯浠剁殑浠卪=-3 甯屾湜鑳藉甯姪鍒颁綘锛岃阿璋~...
绛旓細(1) a=22.5 / 15=1.5 鍏/搴 (2) b=(50-20X1.5)/(30-20)=2 鍏/搴 (3) 20搴︽椂姘磋垂=1.5X20=30鍏冿紝鍒60鍏<姘磋垂<90鍏冩椂锛岃秴鏀负 30鍏<姘磋垂<60鍏冿紝鍗宠秴閲忎负15搴<鐢ㄩ噺<30搴︼紝鍒欐荤敤閲忎负35搴<鐢ㄩ噺<50搴
绛旓細(1)24搴27鍒36绉+23搴32鍒52绉.=锛24搴+23搴︼級+锛27鍒+32鍒嗭級+锛36绉+52绉掞級=48搴+59鍒+88绉 =49搴28绉.(2)66搴18鍒48绉-31搴40鍒23绉=34搴38鍒25绉 (3)11搴25鍒26绉捗9=102搴48鍒54绉 (4)82搴17鍒44绉捗4=20搴34鍒15绉 锛5锛夆垹AOC=180搴-67搴38鍒喢2=44搴44鍒...
绛旓細1 98%*97%=95.06 2 50%*90%+30%*85%+20%*80%=86.5 3 锛1锛0.9*0.9*0.9*0.1*0.25=0.018225 锛2锛1-0.1*0.1*0.1*0.1=0.9999
