1、 6212 112xx A2x B 2x C 2x D 2x 2 A18 B6 C 13 D12 3 A 2=4x B 10 x x C 210 xx D 210 xx 412127 A B C D 4 6 54 52 A1 B2 C3 D4 6 500“”308“”0616“”0 618“”0618 1000“”0 620 A B C D 1 2 74xx 81863 91kyx2yk xk1k20ABA23B 10 x1x2230 xx1212xxx x=1144400 121234“3”P3“4”P4P3 P4“”“=”“”12 13 14 13ABCACB=90 D E FAC AB
2、BCCE=3DF=14kyxAkyxAxyBDxADBCABCD2k 15x20axb abx1=m+1224xmba 1620kykxAay1Ba+1y2y2y1 a 1068 1712 1112333 222 31515 324142xx 188 12410 xx 22411xx x 194214111aaa3a 205ABCDACBDOBEACCEDB OBEC 20 215 21 1_ 2B_ 385%C 225ABCDPBC 1ADH 2BDEFBF=DF 22 23512211.2 246(52)(52)=1(0)aaa a(1)(1)=1(0)bbbb5521212 33 52
3、33 5 123 3 2112332 32018201720172016 259ABCDABACAB2AC4ACBDOACOBCADEF 1_ABEF 2ABCDEF4 _ 25 269 AAxAyCCxCyMACAMPCMQPM=MQPA=QCMACMxxxxAMMCyyyy=22ACMACMxxxyyyM2ACxx2ACyy 1ACA13C31ACM 2ABCDABC15 2233D 3A8yx0 xAABxACy2yx0 xBCDy=2xAABCDA 6212 1 2 3 4 5 6 A B D C D B 10220 7 8 9 10 11 x4 2(23)2 12 13 14 15
4、16 3 2 4 10a 10220 1712 1=2 333 2 =2 3 4 2=2152 315151 =22 45 2 =26 54 3=42(2)(2)(2)(2)xxxxx =2(2)(2)xxx=12x4 188 1x24x+1=0 a=1b=4c=1 b24ac=(4)2411=120 x=41242 32322 x1=2+3x2=234 24(x1)2x(x1)=0(x1)4(x1)x=02(x1)(3x4)=0 x1=03x4=03 x1=1x2=434 194 111()11(2)(2)aaaaaa 211(2)(2)aaaaa=12a3 a=3=14 205 BEOCC
5、EOB OBEC2 ABCD OC=OBACBD3 BOC=90 OBEC4 OC=OB OBEC5 215 141 2362 33 485%0.80.30.90.7=0.74 C0.75 225 B 235 x(x+1.2)1221+1.2xx2 x=1.63 x=1.64 7.5 5 246 12 391 2=2+3+3+22 =2+2+233 31201820172018201712017201620172016 4 2018201720172016 1120182017201720165 20182017201720166 259 1a=901 245903 3ABACAB=2AC=4
6、BC=25 ADBCh=4 555 EF=ACAECFAECF4 AF=8 556 AECF=AF h=8 554 55=3257 EF=BDBEDFBEDF42 DF=12 558 BEDF=DF h=12 554 548559 261ACA(13)C(31)22ACMACMxxxyyy11MMxy ACMM(11)1 2ACBDM ABCDMACBD A(15)C(33)22ACMACMxxxyyy 14MMxyMM(14)2 DD(,)22BDMBDMxxxyyy 46DDxyDD(46)3 3A(a8a)B(4a8a)C(a2a)4 ABABCDABCDxxxxyyyy4882DDaaaxyaaa414DDaxya D(4a14a)y=2xA1(27477)5 ACACBCACBDxxxxyyyy4828DDaaaxyaaa742DDxaya=D(74a2a)y=2xA2(27747)5 ADADCBADCBxxxxyyyy4828DDaaaxyaaa42DDaxya=D(4a2a)y=2xA3(24)8 AA1(27477)A2(27747)A3(24)9
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