a^2+4<0
    (2y－4)²－4(y－2)(3y－7)≥0
    (sqrt(3)/4*t-2/5*t)^2+(3/16*sqrt(3)*t-3)^2<=1
    4/9*x^2-184/9*x+235<0
    x^2+x-4048≥0
    x^2-x-4046<0
    t^2/50-t/2+1/2≥0
    x²-x-6<0
    x²＋3x＋2＜0
    0.7X-200≥X-240
    (x+1)²(1-x)>0
    (x+1)²(x-1)>0
    8-2x≤x-1
    100+x*6>11x
    -12x+1320>=220
    -(1/45)x^2+4x+60>=220
    xlnx+x-1>0
    2*0.3-4<3m*0.3-6m
    2*0.3-10+6<3m*0.3-6m
    2*2-10+6<3m*2-6m

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