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6361nsnx2−8nx+7s=0sAB6k+1CD4k+3219979434A16966B16975C16984D170093{ai}22110iiiiaaaa++−+=11iiaa+−≠i=0,1,2,,nna1=an+1=110niia−=∑A2B−1C1D04αβax2+bx+c=0abcα2αβ59851kkαβ=⎛⎞⎜⎟⎝⎠∑A1B2C0D3i5a+b+c=abc()()()()()()222222111111bcacabAbcacab−−−−−−=++AA3B−3C4D−46xi{1,2,,n}i=1,2,,n()112niinnx=+=∑x1x2xn=nx1,x2,,xn1,2,,nnA4B6C8D99541PA1A2AnPA1A2h1A2A3h2An-1Anhn-1AnA1hnP1212nnaaahhh+++ai=AiAi+1i=1,2,,n−1an=AnA1__________2aa1a__________3()222sin2,2cos2aaFaaaθθθ++=++aθRa0aθF(a,θ)__________4t0x22xtx+−=__________5{1,2,3,,3n−1,3n}n{x,y,z}x+y=3zn__________6knxn+x+1xk+x+1(nk)k__________20SSS20{an}a1=3an=13na−n2ann220abcR+a+b+c=11327a2+b2+c2+4abc150ABCIOBOKABNCBMMC=NA=ssABCIKMN50M(x,y)xy1x121y1349M450f(x)=x3+ax2+bx+cb0ab=9c1C2B3D4C5C6C125323+23−495586(kk)(3m+22)mN+2337