2x-1/5≤x+7/3
    4x/7-3≥-11
    lnx=5
    1/(2880*256*n^4)<=0.5*10^-7
    15*x^2-750*x+8060<=0
    125 * x ^ 2 - 2200 * x + 8060 <= 0
    15*x^2-2200*x+8060<=0
    2X1+X<=1200 3X1+4X2<=2400 x1+x2<=800 X1-x2<=450
    2a^2+60小于等于26a
    a^2大于1
    2x+3>6-2
    x(6x+5)<4
    1+2x^2/x^4+1<=2
    (1-4/7x=(1-40%)(x+18)
    1.5(130(1+x)) = 130(1.5(1+x))
    x+x/3>10
    x+x>5
    9x+4>10
    3+x<5
    6

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