x^2-3x-10≥0
    -x^2-x+30≥0
    -x^2-x-30≥0
    x^2+2x-3≥0
    x^2-7x+6≦0
    x^2-3x+2<0
    3x^2-x+2<0
    (x-490)÷x>0.3
    (x-490)/x>0.3
    (60+x)-490/(60+x)>0.3
    60+x-490/60+x>0.3
    60x-490/60x>0.3
    4x-4x^2>-3
    4x-4x^2<-3
    -3x^2+x>2
    3x+1/2-1≥x
    -3m^2-4m+4>5
    -x^2+120*x-1600>1600
    -1/2*x^2+60*x-800>800
    21m^2+16m-9＞0

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