2*(x^2/300000) -3*x + 300000 >= 0
    2*(x^2/300000) -3*x + 300000 <= 0
    300000 <= 3x-2*(x^2/300000)
    300000/x <= (3-2*(x/300000))
    x^2-2√2*x-1≥0
    b^(2)－12b≥-36
    b^(2)－12b＋36≥0
    -x>2*1
    3x>2x+1
    x^2-6x+3<0
    42.58(30-x)+60x>1500
    42.58(30-x)+55x>1500
    10800×（1+a％）×1440≥10800×（1+20%）
    k^2>=16 k<5 k>-5
    k^2>=16 k<>5 k>-5
    k^2>=16
    k^2=16
    2(x-3)+1≥5x
    19600+(X-400000)*0.0466>30960
    2(2x-1)-3(5x+1)≤6

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