x[1200-30（x-30）]=36750
    [（110.8-110)2+(109.4-110)2+(111.2-110)2+(109.5-110)2+(109.1-110)2]/5
    （110.8-110)2+(109.4-110)2+(111.2-110)2+(109.5-110)2+(109.1-110)2
    (109.4-110)2
    （110.8-110)2
    1.095909+0.1(1.095909-(2*0.1)/1.095909)
    1.095909+0.1(1.18725-(2*0.2)/1.18725)
    1.095909+0.1(1.095909-(2*0.1)/1.095909
    (1.1+1.091818)/2
    (1.1+1.191818)/2
    1.435133+0.1*(1.435133-(2*0.5)/1.435133)
    1.358213+0.1*(1.358213-(2*0.4)/1.358213)
    1.277438+0.1*(1.277438-(2*0.3)/1.277438)
    1.191818+0.1*(1.191818-(2*0.2)/1.191818)
    1.1+0.1*(1.1-(2*0.1)/1.1)
    (x^2-3x+2)*(x-3)
    0.05/(1+0.05a)-0.1/(1+0.1a)
    1/3.1313131313131313131313
    666^6
     X+8% = 125896

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