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    770×8.314×ln(1.03÷x)=90.44÷8.314
    lnx=0.03
    s^3+10*s^2+100
    x^2/0.1-x=1×10^-7
    x^2/0.1-x=1.75×10^-5
    lnx=7.91
    lnx÷ln250000=60÷8.314×(1÷600-1÷450
    (3+X)*(4+X)*(5+X)=120
    x+3=(60-x)×3/2
    2x-(3/x)
    lgx=-0.2425
    x^5=-1/4
    (10+x)(280-10x)=3120
    (700-10x)(x-40)=2000
    (1+x∧2)½
    ((x-97000)*0.76)/1.11+((x-97000)*0.76)/(1.11^2)+((x-97000)*0.76)/(1.11^3)+((x-97000)*0.76)/(1.11^4)+((x-97000)*0.76)/(1.11^5)+35000/(1.11^5)-485000=0
    -485000*(1+x)^5+77300*(1+x)^4+77300*(1+x)^3+77300(1+x)^2+77300(1+x)+77300+35000=0
    -485000*(1+x)^5+76600*(1+x)^4+76600*(1+x)^3+76600(1+x)^2+76600(1+x)+76600+35000=0
    (700-10x)(x+40)=2000
    ln(1+1/n)

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