4x^2+25x<-6
    -6x^2-18x<12
    3<2x^2-x
    1
    6x^2+18<21x
    15x+63<12x^2
    15x^2+2<11x
    12x^2-16<4x
    -20x^2<18x-14
    20x^2+57x+40<0
    -4<-4x^2-6x
    -2x-16<-3x^2
    {3x-2，x＜0
    2m∧2+m+1＞0
    -2m∧2+m+1＞0
    2-4x<3(3x-1)
    9x+6(30-x)<=217
    850<=700+6x<=862
    850<=700-9x<=862
    458<=700-9x<=470

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