(950x+330)*2.703<(1083x+330)*2.29
    (950x+330)*2.68<(1083x+330)*2.58
    (884x+330)*2.88<(1083x+330)*2.28
    (1016x+330)*2.48<(1083x+330)*2.28
    (950x+330)*2.98<(1083x+330)*2.58
    (950x+330)*2.68<(1083x+330)*2.28
    -41800+30000-4500+x-x*0.1/4≥3000
    -16300+x-x*0.1/4≥3000
    -6300+x-x*0.1/4≥3000
    -6300+x-x*10%/4≥3000
    -50x^2+525x-1900≧0
    (3-2a)*(3-2a)-8*(8-3a)>0
    2^(-x)<0.3
    2^-(x)<0.3
    2x+1>5 x+1>4(x-2)
    x+1>4(x-2)
    x-2/x>-2x+1
    9*x^2-8*x+30>0
    4x-1>3x+1 x+4<4x-5
    x-6>-2x

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