80x+1440<64x+1728
    3*sin(π/6-3*x)+1<2.5
    3sin（π/6-3x）+1<2.5
    x(x+sqrt(x2+1))(x2+1)12+1(x+sqrt(x2+1))>0
    -120x^2+180x-60>0
    a^2-8a+25>0
    x/(2x-1)＞1
    2－k＞0 －k－1＞0
    0.375x+6.75＞4
    2－k＞0 1－k＞0
    2－k＞0 1+k＞0
    2－k＞0
    72-3t>0.5t^2
    5x-x^2>4
    X^2-x—6＜0
    -1≤((x-1)/(2 x-3))≤2
    30x+25(80-x)-2200<0
    0.34x+5880>0.4x+2350
    0＜2018-（x-2）*180＜180
    x²-2x+5大于0

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