36-（64+x）=100
    1000=72.8/(1+r)+78.4/(1+r)^2+ 81.2/(1+r)^3+ 1134.2/(1+r)^4
    1000=72.8/(1+r)+78.4/(1+r)2+ 81.2/(1+r)3+ 1134.2/(1+r)4
    0.2877-(t-50)^2/600 = -(t-150)^2/100/2
    0.2877-(t-50)^2/300= -(t-150)^2/100/2
    2x/2+x
    4.893-(t-50)^2/180000=-(t-150)^2/20000
    x+x*9.4%=8923.9
    x+x*10.8%=18777.7
    1750k-5000*(1+k)*0.08*0.2
    x*0.3*34=2
    x*0.5*34=2
    1.5*x*101=208
    1.5*x*101=235
    2*x*101=235
    x*0.5*100=235
    x*x*0.5*100=235
    x*x*0.5*100
    x*x*0.3*34=235
    x^3-35x^2-275x+2125

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