（39.402+x）×1.55＝39.402+70.934-x
    x^3+1
    lnx=1
    1/1210*x-1/4840*x
    [(x-290)*(1-25%)]/1410=[(x-170)*(1-25%)-258.75]/1210
    (x-290)*(1-25%)/1410=(x-170)*(1-25%)-258.75/1210
    x-290*1-25%/1410=x-170*1-25%-258.75/1210
    x^2+48=(36-x)^2
    x^2+48=(36-x)^2
    x^2+48=(36-x)^2
    18x-36=18*(x+1)*90%
    18x-36=18*(x+1)*90%
    tanx=7
    tanx=7
    64x/99.5+96.06x/100.12=20.13
    64x/99.5+2.91x/99.9=20.13
    53000x^61-54000x^60+1000=0
    5x^2-2sqrt(2)x+2/9=0
    5x^2-27x+36=0
    （1409x-84）*（x-0.03）／81=0.14*（（x-0.06）／0.09）^2+0.02*（x-0.06）／0.09+0.02

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