x + 13+ x + 1= 6
    -x-1/x
    x^2-65x+900=0
    x^3-x^2-x
    0.93496=(0.0101x^2+0.0017639x-0.0040837)*(ln(491/167120))^3+(0.14386x^2+0.018153x-0.088198)*(ln(491/167120))^2+(0.59505x^2+0.03407x-0.65417)*(ln(491/167120))+(0.5818x^2-0.08846x-0.6729)
    1/0.93496=(0.0101x^2+0.0017639x-0.0040837)*(ln(491/167120))^3+(0.14386x^2+0.018153x-0.088198)*(ln(491/167120))^2+(0.59505x^2+0.03407x-0.65417)*(ln(491/167120))+(0.5818x^2-0.08846x-0.6729)
    x²+48x-384＝0
    1000=[40-40(1+y)^(-5)]/y+1000/(1+y)^5
    0.93496=(0.0101x^2+0.0017639x-0.0040837)*(ln(491/167.120))^3+(0.14386x^2+0.018153x-0.088198)*(ln(491/167.120))^2+(0.59505x^2+0.03407x-0.65417)*(ln(491/167.120))+(0.5818x^2-0.08846x-0.6729)
    0.93496=(0.0101x^2+0.0017639x-0.0040837)*(ln(491/167120))^3+(0.14386x^2+0.018153x-0.088198)*(ln(491/167120))^2+(0.59505x^2+0.03407x-0.65417)*(ln(491/167120))+(0.5818x^2-0.08846x-0.6729)
    0.000934X^2-0.01961X+0.017406=0
    0.0382951X^2+0.0221904X+0.0049295=0
    -450+x-690-x*0.08/4=500
    60/（1+x）+50/（1+x）²+1000/（1+x）²＝950
    0.0382951X^2+0.0221904X+1.1891157=0
    95x²-6x-105＝0
    -41800+30000+x-x*10%/4-4500=3000
    -41800+30000+x+x*0.025-4500=3000
    -11800+x+x*0.03=3000
    0.926616=(0.0101x^2+0.0017639x-0.0040837)*(ln(496.37387/94919.918))^3+(0.14386x^2+0.018153x-0.088198)*(ln(496.37387/94919.918))^2+(0.59505x^2+0.03407x-0.65417)*(ln(496.37387/94919.918))+(0.5818x^2-0.08846x-0.6729)

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