a-a*lna-1>0
    -(x-4)^2+4>=0
    x>750*x^-0.125-23.48*x^5/12
    x>x^-0.125-x^5/12
    2x^2+3x+1>0
    4x^2+6x+3>-1
    1/6>√x
    1/6>x^(1/2)
    1>6x^(1/2)
    (4x+2)/(3x-7)>3
    5x^2+x>=15x+3
    200*(5x+1-3/x)>=3000
    -1a+sqrt(a*a-1)
    -1a+(a*a-1)^0.5
    3>a+(x*x-1)^0.5
    -1
    3x－x2＋4＞0
    2000x+4x*1000+(108-5x)*1500≤147000
    (2a-7)/3>-(4a/3)
    3(x+1)-1<4(x-1)+3

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