(x-1)^9999-2^9999×x^9999≤x-2
    1-0.2x<0.6 1-0.2x>-2
    20-40x＞（100÷3）x
    20-40x＞33.33333333333333333333333333333333333x
    -647.1419+241.894*n+（281.21*n+18.82*n^2)*(843.63*n+37.63*n^2)/(1687.26+112.89*n)-1.2*(100.94*n+4.87*n^2)*(302.82*n+9.74*n^2)/(605.64+29.22*n)≥0
    5x-1>3(x+1) 0.5x-1≤7-1.5x 2x-1<0 x+5<4
    2[4x/3-(2x/3-1/2)]≤3x/4
    -x≤1 x-2<3 4≤3x-2≤2x+3
    5>x+1 5x-2>3 2x-1<3 2x-3<3x
    13^2*X^2-0.13*10000>0
    0.5÷50≥(1/x-1)^4+(1/x)^4+(1/x+1)^4
    50*x+200 >400*1.08^(x-1)*0.85
    50*x+200>400*1.08^(x-1)
    -6x＜12
    -6x＜-12
    -x^3-x<1
    cos(x)>-cos(2x)
    cosx>-cos2x
    cosC>-cos2C
    x-0.02x≥1640

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