(1-0.4)X<=(4+0.15)*(24-X) (1-0.35)X<=(4)*(24-X)
    (1-0.4)X<=(4+0.15)*(24-X) (1-0.35)X<=(4+0.15)*(24-X)
    (1-0.4)*19<=(4+0.15)*X (1-0.35)*19<=(4)*X
    (1-0.4)X<=(4+0.15)*(24-X) (1-0.35)X<=(4+0.15)*(24-X)
     (1-0.35)X<=(4+0.15)*(24-X)
    (1-0.4)*x<=(4+0.15)*(24-x)
    (1-0.4)*18<=(4+0.15)*(k-18)
    (1-0.4)*17<=(4+0.15)*(k-17)
     0.6x > 24*(x+3) x+6 > -18
     0.6x > 0.8x+3 x+6 > -18
    0.7^x<0.05
    ( x + 1 ) * ( x - 5 ) 大于等于0
    （x+1）（x-5）≤0
    x（x－2）＞0
    x-3>3(x-4)
    (4x-1)/6
    x-3>3(x-4)
    809.56*x^3 ≥11200*x+4928000
    809.56*x^3 ≥11200*x+4928000
    701.612*x^3≥11200*x+4928000

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