12000000*4%*e^(r*(-1))+(12000000*4%+12000000) *e^(r*(-2))-19505360*0.62=0
    12000000*4%*e^(-r*1)+(12000000*4%+12) *e^(-r*2)-19505360*0.62=0
    12000000*4%*e^(-r*1)+(12000000*4%+12) *e^(-r*2)-19505360*0.62=0
    11297664*4%*e^（-r*1）+(11,297,664*4%+12) *e^(-r*2)-19505360*0.62=0
    12*4%*e^(-r*1)+(12*4%+12) *e^(-r*2)-19505360*0.62=0
    ln(1+x)/x
    1+x^(2)
    (1/206265)*x=0.5*sqrt(1+(0.000001*x)^2)
    (1/206265)*x=0.5*sqrt(1^2+(0.000001*x)^2)
    0.000004848132257*x=0.5*sqrt(1^2+((0.000001*x)^2))
    0.000004848132257*x=0.5*sqrt(1^2+(0.000001*x)^2)
    0.000004848132257*x=0.5*sqrt(1+(0.000001*x)^2)
    0.000004848132257*x=0.5*sqrt(1+(0.000001*x))
    (a+3)（a+4）（a+5）
    2x+4x=60
    55×7.91+12.8x=（55+x）×7.98
    55×7.91+12.8x=（55+x）×7.96
    55×7.91+12.8x=（55+x）×7.98
    55×7.91+12.8x=（55+x）×7.98
    55×7.91+12.8x=（55+x）×7.96

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