.aSlimSS1qnnnnn2SSnN）））naqa0,0.7q0.61））1aqa0,0.8q0.711B{a}=8a=，則a102、已知等差數(shù)列前9項(xiàng)的和為，（）99100n（）100（）98（D）97Ck2m3aammm，nna,a,L,a中0112k個(gè)個(gè)個(gè)個(gè)AAAA,AA,nN4{A{B}，*nnnn1n1n2nn2BBBB,BB,nNPQ表示點(diǎn)與不重合.*nn1n1n2nn2dABS為△ABB的面積，則若nnnnnnn1{S}{S}．2．．nneueyuykegcyumq．2nn..a}a6aa0S=61Sn，nn1356NS，2a由k為annSnnnn則k43{}aaaaaaa.an132412n644{a}nS若SaSNa=S=.*nn2nn151121Nn2nNka＜：a，aa(()12Nk(A)anAG“GAG.nG(A)(A)Aaa>aG；nn1Aa-a則G(A)a-a.nn1N1..mminGkmaa1,Ga.miiiikniiG()mn.m且iii1n是G(A)中的最大元素，所以G.ppbb.2anSnn，ba2nnnn1nnbn(T.ncb2)nnnnn3n8n，aSn2nn11n21aSS3n8nn8(n6n5，22nnn16n51a6n5．又a對(duì)nnn..bbbdbad．nnnn1n1b11dn2b17d，當(dāng)n12and3n．31dbb2nn(an1(6n6)n1n2n1，cnb2)nnnnn62922(3n2T，234n1nT6292(3n)2(3n2，34n1n2n2nT62323232(3n2234n1n322)2n32n2n2212T322)(3n2n2n2n2．2nn3a}aa(p,qN)*aaa}.Pp1q1npqna}a1,a2,a3,a2aaa21a；P，n12456783b}c}bc1，nn15bc81，abc判斷a}P51nnnna,{a}b}asin()bnanN*n1n1nn質(zhì)Pb}.naaa32aaa211a67836781b20，c3nnabc20n5．nnnn..3aaa．a(chǎn)82a48a，，a，152626naaaaa3aa2a，，．52637485aaa32aaa21a163a．67836781）b20，c，3nn1120n1n19n1815．b，cn3nnabc20n5．nnnn3aa82a48，a，aa，152626a．nbsina當(dāng)ba．n11nnabsinabsinaaaaa1．pq1p1qp1q1bk，nbbbbbk1b．12kbsinaaaaaak2a的a．n1nn12k1k1nxsinxb設(shè)fxmbm000fmmb，fmmbcfc．取a（1nksinabcca，cabsinan11n21aaca．12k1bsinabsincbsincaak2但a．k2k1k1k1k1an..aanb，1naSa前nSqS1q>0，nnnn1nnN*.2a2an232y254nnx21eeee1ena2n23n1n2.a=qn-1nS=+=+a=?1.n+1nn+2n+1n+2n+1S=qS+1a=qaa=n12121n+1n所以，數(shù)列}qna=q.n-1n由2a，a，a+22a=3a+22q=3q+-0，223232q>0q=2.a=2?N.n-1*na=q.n-1ny2x-=1e=1+a=1+q.22ann2n54由q=1+q2=q=.33因?yàn)?+q2(k-1)>q2(k-1)>q?N.k-1*q-1ne+e+e>+q=，1q-112n4-3nn故e+e+e>.1123..N,baaadn5知是和nnn1n.bb,nN(設(shè)c*c2n12nnn112nnd,T1b,nN.(設(shè)an2*T2d1nn2k1k1kCbaada22n1b2aan1n2nnnn1n1CC2d(aa)2d2n1nn2n1∴Cnn(n2n⑵(1)4nn2d(）CCCdTb222k2nk132n111k1baaaa2da2d(ad)4dCb122212231221將42(C1d2Td2nnn111nn∴T2d2k(k1)k1k1k12d2x=1，S28.=lga、Saan記bnn17nnx0.9lg99=1．，b，bb；111101b1n的公差為，d，728aSan74aa∴∴，∴1，∴aa(ndn．a(chǎn)4d4134n1，，2．blgalg10blgalg111blgalg11⑵記的前項(xiàng)和為，則nTTbbbbnn12．lgalgalga12當(dāng)0≤lga1時(shí)，；29nnn當(dāng)1≤lga2時(shí)，；n當(dāng)時(shí)，；2≤lga3100nn..當(dāng)時(shí)，．lga3nn∴T．0919029003118931000a1n，8aa．n12nn2n1a2n；a，n13na2，nn．a(chǎn)，2nnnmn，aaaaaaaan1n12m1nmnnm2m