20000x/6104.56=(1-(1+x)^(-4))
    20000i/6104.56=(1-(1+i)^(-4))
    52-（x+1）=25
    t/(-t^2+2t+3)=(-t^2+2t)/(3-t)
    (-0.5a^2+1.5a)/(4-a)=a/(-0.5a^2+1.5a+2)
    (-0.5a^2+1.5a)/(4-a)=a/(-0.5a^2-1.5a+2)
    2x^2-9x+10=0
    2x^2-9x+1=0
    20000/6104.56=(1-(1+i)^(-4))/i
    0.25a^4-1.5a^3+2.25a^2-a=0
    1/4a^4=1
    6059=x+x*0.05
    25x^2-121=0
    —2x^(2)—8x—4
    (x^2+0.046095)/(2*x*0.272)=0.447
    (1-e^(-0.1*x))*300*e^(-0.1)=100
    300*e^(-0.1)*(1-e^(-0.1*x))
    (x^2+0.272^2-0.167^2)/(2*x*0.272)=cos63.45
    (x^2+0.272^2-0.167^2)/(2*0.167*0.272)=cos63.45
    32×32+xx-64x+40×40-xx=320

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