5x^2-3<12
    8000000+(50000-x)*100*10≤5000000
    x/（x+1）＞1
    3x^^3-8x^^2+6x>1.75
    （lgx÷lg3）^2-20（lgx÷lg3）≥20*（lg2÷lg3）-3
    t^2-20t≥20*（lg2÷lg3）-3
    2*(100-y)+2.5*y<=480
    2*x+2.5*(100-x)<=480
    2*x2+2.5*(100-x2)<=480
    3x+4≥0 4-2x<-1
    4x-1<0
    -50+（100+x）*1+x≥10
    105m^2-30m+25>0
    -2+x^2-x>0
    x^2-x-2<0
    (-2/x)-(x+1)<0
    -2-x^2-x<0
    x^2+x+2>0
    -50-（100+X）*1%+X>=10
    x²-4x≥4

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