x-3（x-1）≤7
    ((0.2*k+(0.2/3.1416)^2-0.1)*(0.2*k+0.9)-(0.2/3.1415)^2 *(0.2*k+1))/(0.2*k+(0.2/3.1416)^2-0.1)>0
    6x＋5>4x 18－7x<10－3x
    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

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