arctan0.2x+arctan0.067x=π/2
    99.2=（（0.021*x^1.85+326.4）^0.5）*x^0.84
    arctan0.33x+arctanx=π/2
    （62500-1.1X）*10.4/22.4*0.9=8.8X
    -x²+12x-24=0
    x²-12x+100=32
    5x²-12x+36=32
    5x²-12x+36=3
    w^2-43.5w+45.5=0
    x^2+160x=86892.25
    1/d+1/(d+2)+1/(d+3)=1/(d+5)
    d^3+10d^2+25d+15=0
    7.5828=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））
    arctan5x-arctan5=-7.12
    arctan5x-arctan5=-7
    arctan5x-arctan5+52=45
    （26.127+x）×2.55＝52.254+69.681-x
    （26.127+x）×2.35＝52.254+69.681-x
    （26.127+x）×2.15＝52.254+69.681-x
    （26.127+x）×1.95＝52.254+69.681-x

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