120-x≤2x 15x+12（120-x）≤1600
    tanx≤0.3
    (m-2)^2-4*(-1)*(m-1)>0
    x²-3xlnx+1>0
    x²-1>0
    c-2>3c
    3c-2>c
    lnx/x＞0.2
    4x²－8x－12＞0
    450<0.04x+0.06(100000-x)<550
    -3^-1≤x^-1≤-3
    x^-1≤-3^-1
    x^-1≤3
    (3x+3)(x^2+x)<0
    x-2＞68
    -5x+2＞0
    x^2>8
    1/(x-4)<1 - x/(4-x)
    1/(x-4)<1 - (x/4-x)
    1/x-4<1 - (x/4-x)

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