(0.01*A)/(1+0.01*A)=15
    (0.01*15)/(1+0.01*15)=Y
    (0.01*Y)/(1+0.01*Y)=Y
    (0.01*X)/(1+0.01*X)=15
    (0.01*15)/(1+0.01*15)=X
    (0.01*X)/(1+0.01*X)=15
    （153452-13229-454.61）*X-6531.48 = 33309
    （153452-13229-454.61）*X-6531.48
    3/2+3/(2m-2)=m/2
    x^2-12x+20=0
    t∧3-t∧2-1＝0
    （153452-13229-454.61）*X-4490.48=40583
    0.93X+7.4（95-X）=238
    0.93X+7.4（100-X）=238
    6400x=(2500-x)*674+(5000-4*x)*270
    487.305=280*（1+x）^4
    95*（1+10%）^3+98*（1+10%）^2+105*（1+10%）^1+108*（1+10%）^0=280*（1+x）^4
    487.305=208*（1+x）^4
    487.305=208*（1+x）^4
    208*（1+x）^4=487.305

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