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    6.22*(5.45+t)^2*(2.43+2/3*t)-14.53*t^2*(4.25+2/3*t)=0
    X=(5.38+4.1*0.5)*83*0.0028*(46^0.5)
    5.46×(5.7+t)^2*(2.6+2/3*t)-18.78*t^2*(4.5+2/3*t)=0
    -1000+280*((1+x)^10-1)/(x*(1+x)^12) = 0
    -1000+300*((1+x)^10-1)/(x*(1+x)^12) = 0
    -1000+200/(1+x)+300*((1+x)^4-1)/(x*(1+x)^5)+300/(1+x)^5 = 0
    -1000+200/(1+x)+300*((1+x)^4-1)/x*(1+x)^5+300/(1+x)^5
    5x^4+6x^2-6+2x
     5x^4+6x^2+6+2x^3
    5x^4+6x^2+6+2x^-2
    5.4237=(26.99*0.829*(x+0.1))/(1+0.829(x+0.1))*(100-7.84-1.06)/100*1/(1+0.31*1.06)+(1.31(x+0.1))/(1.31*0.101325)
    2^x+7^x+x^2+x=-125
    100/(x+62)+100/(x+50)+100/x=1.5
    2^x+7^x+x^2+x=125
    2^x+7^x+x^2+x=-125
    1.63X+X = 74
    2.66X+X = 74
    4.33X+X = 74
    7.05X+X=74
    (86942-x)/x=27.19%

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