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    100000=(1-(1+x)^(-60))/x*(810+910*(1+x)^(-60)+1010*(1+x)^(-120))
    w^2*(1+w^2)*(100+w^2)=25^2
    100000=((1-(1+x)^(-60))/x)*(810+910*(1+x)^(-60)+1010*(1+x)^(-120))
    58440.46218((1+i)^5)=1100((1-((1+i)/12)^(-60))/(i/12))
    2x-1/3+5x+1/2≤1
    58440.46218((1+i)^5)=1100((1-((1+i)/12)^(-60))/(i/12) )
    58440.46218(1+i)^5=1100(1-((1+i)/12)^(-60))/(i/12)
    4xxx+6xx+2=0
    -74435-91.715*(950+273.15)+8.314*(950+273.15)ln(([(1/5)-1]^4)*x^1 )= 0
    -74435-91.715*(950+273.15)+8.314*(950+273.15)ln(([(1/0.05)-1]^4)*x^1 )= 0
    3*x*x+22*x+10=0
    1.8*sin(90*x)=0.0548*x
    1300(1+x^(2))=2925
    -74435-91.715*(700+273.15)+8.314*(700+273.15)ln(([(100/x)-1]^4)*1^1 )= 0
    -74435-91.715*(800+273.15)+8.314*(800+273.15)ln(([(100/x)-1]^4)*1^1 )= 0
    -74435-91.715*(900+273.15)+8.314*(900+273.15)ln(([(100/x)-1]^4)*1^1 )= 0
    -74435-91.715*(1000+273.15)+8.314*(1000+273.15)ln(([(100/x)-1]^4)*1^1 )= 0
    -74435-91.715*(1100+273.15)+8.314*(1100+273.15)ln(([(100/x)-1]^4)*1^1 )= 0
    -74435-91.715*(1200+273.15)+8.314*(1200+273.15)ln(([(100/x)-1]^4)*1^1 )= 0
    -74435-91.715*(1200+273.15)+8.314*(1300+273.15)ln(([(100/x)-1]^4)*1^1 )= 0

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