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    {100*【(1+x)^10-1】}/【x+(1+x)^10】+7000*(1+x)^(-10)=5000
    x/(2+x)
    (1+x/3)3=1%
     2 { x }^{ 4 } = 4x+8
    arctan1/x
    20(1+y)y+40(1+2y)y=20(1+y)+40(1+2y)+100
    20(1+y)²+40(1+2y)²=20(1+y)+40(1+2y)+100
    (40-2x)²=484
    (24-x)(24-x)+(7+x)(7+x)=625
    (1+1/x)*e^(-1/x)=ln2
    (1+x)*e^(-x)=ln2
    (20-x)(70-x)=2240
    √4-x²
    20(1+x)^=45
    3(cosx)^2=1
    3(cosx)²=1
    -81x^2+496x-648=0
    -81x^2+496x-648
    9/64(m-4)^2+(2-1/2m)^2=m^2
    a*a+a=600

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