(41.789+x)×1.95＝72.378+41.789-x
    (41.789+x)×1.75＝72.378+41.789-x
    (41.789+x)×1.55＝72.378+41.789-x
    (41.789+x)×1.35＝72.378+41.789-x
    (41.789+x)×1.25＝72.378+41.789-x
    (41.789+x)×1.15＝72.378+41.789-x
    9x²+10x-15=0
    x^0.5=0.275508
    ln（x）=0.275508
    x-1+x^0.25=0
    x-1-x^0.25=0
    4x^3=3x一1/2
    0.625x=13.5+3/8x
    0.625x=13.5+3/5x
    0.625x=13.5+3/5x
    [（x+24）÷60]+（x÷75）=1
    x-x*0.2=86
    ln(1+x)-x/2=-0.577
    ln(1+x)-x/2=0.577
    -0.577=x/2-ln(1+x)

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