180+56.4-1.8*9+56.4-1.8*10+...+56.4-1.8*20+20(x-20)>=800*79%
    42-（x-9）*1.8<20
    1/6*{1+[1-(1-a)^6]*(23*a+10)/(a+2)} >1/9*{1+[1-(1-a)^9]*(63*a+18+195*a^2)/(6*a+3+19*a^2)}
    1/6*{1+[1-(1-a)^6]*(23*a+10)/(a+2)}<1/9*{1+[1-(1-a)^9]*(63*a+18+195*a^2)/(6*a+3+19*a^2)}
    48-（x-9）*1.8<20
    3【x-1】+1＞5x-2【1-x】 5-【2x-1】＜-6x
    x-3【x-2】≥4 【2x-1】÷5＞【x+1】÷2
    x-3【x-2】≥4 【1+2x】÷3＞x-1
    0＜x^2－x－2≤4
    3【x-1】+13＞5x-2【5-x】 5-【2x+1】＜3-6x
    3【2x+5】＞2【4x+3】
    [1+(1-(1-a)^9)*(195*a*a+63*a+18)/(19*a*a+6*a+3)]/9<[1+(1-(1-a)^6)*(24*a+10)/(3*a+2)]/6
    (1+(1-(1-a)^9)*(195*a*a+63*a+18)/(19*a*a+6*a+3))/9<(1+(1-(1-a)^6)*(24*a+10)/(3*a+2))/6
    (1+(1-(1-a)^9)*(195*a*a+63*a+18)/(19*a*a+6*a+3))/9<(1+(1-(1-a)^10)*(186.89*a*a+54.23*a+12.8)/(17*a*a+5*a+2))/10
    195*a*a+63*a+18<198.76*a*a+70*a+19.36
    (1+(1-(1-a)^9)*(51*a*a+63*a+18)/(19*a*a+6*a+3))/9<(1+(1-(1-a)^10)*(186.89*a*a+54.23*a+12.8)/(17*a*a+5*a+2))/10
    (1+1-(1-a)^9*(51*a*a+63*a+18)/(19*a*a+6*a+3))/9<(1+(1-(1-a)^10)*(186.89*a*a+54.23*a+12.8)/(17*a*a+5*a+2))/10
    (1+1-(1-a)^9*(51*a*a+63*a+18)/(19*a*a+6*a+3))/9<(1+(1-(1-a)^6)*(24*a+10)/(3*a+2))/6
    (1+1-(1-a)^9*(52*a*a+63*a+18)/(19*a*a+6*a+3))/9<(1+(1-(1-a)^6)*(24*a+10)/(3*a+2))/6
    52*a*a+63*a+18<198.76*a*a+70*a+19.36

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