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    x-x/4
    x=tan(x/2)
    5X2 一1=9
     x(45-x) = 600
    (1+x)^60=12570
    f^2-12f+32
    y^3+5y-36=0
    -16x+4x=0
    (x-2)²=(2x+3)²
    x(60-3x/2)=144
    (2(0.248x-0.198)-(0.248x-0.198)^2)*72.8+52/(x-0.8)=80
    10*x/3=1-1/(1+x)^5
    X*60%=2000
    -300*(1+x)^5-50*(1+x)^4+50*(1+x)^3+150*(1+x)^2+250*(1+x)+350+(1-1/(1+x)^5)/x=0
    -300*(1+x)^5-50*(1+x)^4+50*(1+x)^3+150*(1+x)^2+250*(1+x)+350+(1-1/(1+x)^5)=0
    4900*x/1875=1-1/(1+x)^5
    3.81129*x=1-1/(1+x)^10
    2*10(20-x)=5*12x
    42(144-x)=2*15x
    -520000+200000*((1+x)^10-1)/(x*(1+x)^10)-1500000/(1+x)^10=0

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