x＾-1
    （x-1）^2
    log(10,1/(0.1049x+1))=21.6-7.65*3*x
    x/1-lnx=0
    log(10,1/(0.0005585x+1))=21.6-7.65*3*(x/(132*100*(0.0005585x+1)))
    −x^3 +21x^2−126x+206=0
    1400x-400-500x｛1400x/（1+17%）*17%-50x｝*（1+10%）=0
    x(45.59+x)=0.3333*0.3333
    x(45.59－x)=0.3333*0.3333
    [(3-0.35)*0.1+0.35]x=3*0.35x-2
    13000/800x-6500-3000/800x-345/800x = 2000
    16.25x-6500-3.75x-0.4125x = 2000
    16.25x-6500-3.75x-0.4125x=2000
    3600（1+x）²＝3630
    x+1/x=57/40
    x^2+x=57/40
    40x^2+40=57x
    40x^2-57x+40
    -250a^2+122a=137
    -250x^2+122x=137

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