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
    2-j
    (-a^2+8a+20）(2a-24) = 2a(8a+44-a^2)
    3.3/(75+x)x=0.825
    3.3/(75+25)*25=
    3.3/(75+x)x=1.25
    √36665809/100

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