4000(1+x)^2＝1
    x+1＝0
    5-x=23.2*0.5*(0.0001*10*(4.3^2))
    5-x=2320000*0.5*(0.0001*10*(4.3^2))
    (5-x)/23.2=0.5*0.0001*10*[(4.3)^2]
    (5-x)/2.32=0.5*0.0001*10*[(4.3)^2]
    (5-x)/2320000=0.5*0.0001*10*[(4.3)^2]
    (5-x)/2320000=0.5*0.0001*10*[4.3^2]
    (5-x)/2320000=0.0001*10*[4.3*x-(x^2/2)]
    5-x=2320*[4.3x-((x^2)/2)]
    134.4+（20－x）*4.3＝（50+210.6+6.5x）/1.5
    197.93+25.73x=400
    134.4+（26－x）*4.3＝（50+184.0+6.5x）/1.5
    (5-x)=2320*[4.3x-((x^2)/2)]
    1.3x+x=26
    1.3x+x=
    x²-4x-99＝0
    （x^2-4x)(x^2-4x-4)＝x^2
    z^2-10*z+9=0
    x^5+10x^3+20x-4=0

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