9-（4-x)=2
    16500* ((1+i)^360-1)/(i*(1+i)^360)=2720000
    91700 * (1 + x)^4 = 145000
    2x^3+11x^2+12x-20=0
    x+7/3x=162
    -X∧2+3X-2=0
    0.01/0.99=12.8*x/(1-2*x)
    0.01/(0.99*0.99*6.4)=2*x/(1-2x)^2
    x=1+2
    X∧2+8X＋23=0
    x^2-45.5x+45.5=0
    1/x+1/(x+1)+1/(x+3.5)+(2x+6)/(x^2+6x+13) = 0
    1/x+1/(x+1)+1/(x+3.5)+(2x+6)/(x^2+6x+3)=0
    x*［1/x］
    （5/2X+X)=560
    x/sqrt(1-x*x)-ln(1)-ln(3)
    200200x-178.75=360000000
    10/（0.8a-0.6(1-a^2)^0.5)-10/a＝50
    1/x^2
    2((e^(2x))*(x^2))+lnx=0

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