20000*（1+x）^5+20000*（1+x）^4+20000*（1+x）^3=69787
    (4.5+0.45*5)/19.01
    x^2-20x-250000
    (4.9+0.45×5)/19.01=
    x^2-20x+250000
    y^3-4y+16=0
    x-250000/x=20
    x-2500/x=20
    0.09x^2-10x+5000=0
    ln(0.4*x)/x=4751/59270000
    6000*（1-x）*（1-x）=3600
    x*x*x- 5*x*x+ 10*x - 80 = 0
    s^3+2*s^2+s+1=0
    ln(0.9*x)/x=4751/59270000
    (jw)^3+2*(jw)^2+jw+1=0
    1.36/0.64^2
    1.25/0.75^2
    607.3+3.85x-0.0423x^2
    8＾2+10＾2=x＾2
    1-2x-3/5<=3x-1/4

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