15*4*X+5*(4+0.15)*X>=15*(1-0.35)*(24-X)+5*(1-0.4)*(24-X)
     15*4*X+5*(4+0.15)*(24-X)>=15*(1-0.35)*X+5*(1-0.4)*X
    (1-0.4)*X<=(4+0.15)*(24-X) (1-0.35)*X<=(4)*X 60X+5*4.15X>=3X+0.65*15X
    (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)

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