[(1+0.1)^n-1]/[0.1*(1+0.1)^n] = 8000/1260
    100*(1+i)^(-1)+200*(1+i)^(-2)+300*(1+i)^(-3)+400*(1+i)^(-4)+500*(1+i)^(-5)=0
    0.003X^2+29.94X-79018.55=0
    [(1+i)^5-1]/[i*(1+i)^5]=2
    [(1+0.1)^5-1]/[0.1*(1+0.1)^5] = 10000/5000
    x*x-31/18x+385/1296=0
    x^=1
    (x-2)(x-2)(x-3)-5(x-2)-4(x-3)-8=0
    -99X-0.738X=0.257-45
    n5/6-11=13/2
    (x+8)/6=1.3
    (x-8)/6=1.3
    (x+1.3)/6=8
    (x-1.3)/6=8
    44*((t/100)^3)*(1-t/100)^7=0.7
    44*（t/100)^3*(1-t/100)^7=0.7
    5n=1.85
    7x/4+3.5=14
    400*e^(-15x)=25
    9^x+12^x=16^x

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