-4/πarctanx
    e^x=lnx
    e^x=lnx
    32^x-31^x=63
    32^x-31^x=63
    32^x-31^x=63
    x ^2/1-x =4.5 ×10 ^-7
    x^2/(1-x)=0.00000045
    x^2/(1-x)=4.5*10^-7
    (0.526+2*x)^2*(0.982+x)=34
    x/(1+100/100)-x/(1+130/100)+x*2/(1+100/100)-x*2/(1+115/100)=100
    x/(1+100/100)-x/(1+130/100)+x*2/(1+100/100)-x*2/(1+115/100)=300
    V=466.66+110.00+23.07+0.01V+23.16+0.0002V+124.58+0.0020V+0.0538V
    2/3*x/(1+1/100)-1/(1+1.15/100)+1/3*x/(1+1/100)-1/(1+1.3/100)=300
    K=2606.5+104.26+0.01K+60.86+0.0002K+914.63+0.0034K+0.0538K
    K=2606.5+104.26+0.01K+60.86+0.0002K+692.91+0.0026K+0.0538K
    V=466.66+0+18.67+0.01V+20.70+0.0002V+75.90+0.0015V+0.0538V
    x+e^x
    x^3＋2x^2＋12x－24＝0
    16-(2*sqrt(5)-x)^2=4-x^2

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