(-4(0.466*300+h)-sqrt(16(0.466*300+h)^2+4((-300+0.6)^2+4(0.466*300+h)*(300+h))))/2≥-150*sqrt(3)
    (-4(0.466*300+h)-sqrt(16(0.466*300+h)^2+4((-300+0.6)^2+4(0.466*300+h)*(300+h))))/2>=-150*sqrt(3)
    (-4(0.466*300+h)-sqrt(16(0.466*300+h)^2+4((-300+0.6)^2+4(0.466*300+h)*(300+h))))/2>-150*sqrt(3)
    x^2-3*x+2>=0
    x^2+3*x+2>=0
    【x+1】>4
    abs(x+75/4/x-x/300-0.466*300.4)≤0.6
    x-5/x+1＜0
    abs(0.466*300.4-29/30x-2250/12/x)≤0.6
    a^2-4a^2+76＜0
    0.8*119x≥120x*0.7
    10.5－x＞0
    -0.5x＾2＋6x－13.5＞0
    2［500（1+x％）＋500（1＋x％）＾2］＋3860≥7000
    (139.8-1/(4*a))/(150*a-1/(600*a))>=-0.5
    (139.8-1/(4*a))/(150*a-1/(600*a))<=0.5
    (139.8-1/(4*x))/(150*x-(1/(600*x)))>=-0.5
    (139.8-1/(4*x))/(150*x-(1/(600*x)))<=0.5
    2*0.95*15+x*44*0.6<6*0.95*15+x*0.6*29
    (139.8-1/(4*x))/(150*x-(1/600*x))<=0.5

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