(30-x)/0.14=0.5*2.3*2*(x-1)^2*(1+x/50)
    x^2+x-2=0
    51=90-arctan 0.1x-arctan 0.001x
    (30-x)/0.14=0.5*2.3*2*140000*(x-1)^2*(1+x/50)
    ln1/(1-x)=8.318
    200(x－3)＝150（x＋5）
    (30-x)/140000=0.5*2.3*2*140000*10^(-6)*(x-1)^2*(1+x/50)
    arctan0.1x＋arctan0.001＝39
    x×2x×2x＝1000
    36/（x+4）+0.4=36/x
    x=0.5*2.3*2*140000*10^(-6)*((30-140000x)-1)^2*(1+(30-140000x)/50)
    102+x=103.824+0.618x
    51=90-arctan0.1x-arctan0.001x
    x=0.5*2.3*2*0.14*((30-140000x)-1)^2*(1+(30-140000x)/50)
    x^(2)×2x＝1000
    (x^2/9)+(16/x^2)=-10/3((x/3-(4/x))
    102+x:168+x=0.618
    x=0.5*2.3*2*0.14*(1-(30-140000x))^2*(1+(30-140000x)/50)
    x=0.5*2.3*2*0.14*(1.5-(30-140000x))^2*(1+(30-140000x)/50)
    (2*x+40)/log(50/(x+70))=(x-120)/5000

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