0.2*k+(0.2/3.14)^2-0.1>0
    ((0.2*k+(0.2/3.14)^2-0.1)*(0.2k+0.9)-(0.2k+1)*(0.2/3.14)^2)/(0.2*k+(0.2/3.14)^2-0.1)>0
    (x+2)/3-(2*(x+1))/2>=1
    (x+3)/2-(2*(x+1))/2>=1
    87.6×117.54%^x-51900×106.7%^x =0
    87.6×117.54^x-51900×106.7%^x =0
    87.6×117.54%^x-51900×106.7%^x ≥0
    87.6×117.54^x-51900×106.7%^x≥0
    2000-10*n>0.196*sqrt(n)
    {2x＋3<1 {x>1/2（x－3）
    2x＋3<1 x>1/2（x－3）
    0<180(n-2)-1510<180
    0<1510/[180(n-2)]<180
    0<1510/180(n-2)<180
    2x-4>0 3－x<0
    ((0.2k+(0.2/3.14)^2-0.1)*(0.2k+0.9)-(0.2k+1)*(0.2/3.14)^2)/(0.2k+(0.2/3.14)^2-0.1)>0
    0.2k+(0.2/3.14)^2-0.1>0
    (0.2k+(0.2/3.14)^2-0.1)*(0.2k+0.9)-(0.2k+1)*(0.2/3.14)^2>0
    (0.2k+(0.2/3.14)^2)>0
    100x^2-40000.03842x+4000000≥0

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