32+25x>64
    (2x+1)(3x+2)>12
    x≥1
    8x<=(x^2)+1+6x<0
    8x<=(x^2)+1+6<0
    1-(0.4)*n>0.99
    x(x²-1）>0
    －x≥2
    40+2.5≤50(1-y)
    40-2.5≤50(1-y)
    40 2.5≤50(1-y)
    x^2+4x+3<0
    (x-40)[500-10(x-50)]≥8000
    a²＞1
    -1/15*(x-5)^2+3＞2.4
    (2x+1)/（x-1）<=1
    (x+5)/（x-14）<=0
    x+5/x-14<=0
    x^2+3x-18>=0
    x^2-8x-20<0

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