2x^3+20x^2+50x+10=0
    ［10(10-x)+x ］x2-1=10x+(10-x)
    2［10(10-x)+x ］-1=10x+(10-x)
    2［10(10-x)+x ］-1=10x+(10-x)
    ［10(10-x)+x ］x2-1=10x+(10-x)
    10(10-x)+xx2-1=10x+(10-x)
    100x=tan(x)
    a/(a-900)=4
    a/(a-900)=4
    -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

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