(x-1)/2-(2x-1)/3=x+1
    9x+3e=9e-4x
    x^2-√3x+2/9=0
    X－（√1-X）＝√42/5
    0.11=0.6*（1+G）/11.28+G
    (5+x)*(4+x)=56
    x÷1.2+x÷4＝650
    (1+y/2)^(-(0.5))×(6.50/2)+(1+y/2)^(-3.5)×100+(1+y/2)^(-(0.5+1))×(6.50/2)+(1+y/2)^(-(0.5+2))×(6.50/2)+(1+y/2)^(-(0.5+3))×(6.50/2)=109.6973
    (1+y/2)^(-(0.5+0))×(6.50/2)+(1+y/2)^(-3.5)×100+(1+y/2)^(-(0.5+1))×(6.50/2)+(1+y/2)^(-(0.5+2))×(6.50/2)+(1+y/2)^(-(0.5+3))×(6.50/2)=109.70
    (1+y/2)^(-(0.5))×(6.50/2)+(1+y/2)^(-1.5)×(6.50/2)+(1+y/2)^(-2.5)×(6.50/2)+(1+y/2)^(-3.5)×(6.50/2)+(1+y/2)^(-3.5)×100 = 116.08
    (1+y/2)^(-(0.5))×(6.50/2)+(1+y/2)^(-1.5)×(6.50/2)+(1+y/2)^(-2.5)×(6.50/2)+(1+y/2)^(-3.5)×(6.50/2)+(1+y/2)^(-3.5)×100=118.28
    101.36 = (1+y/2)^(-(0.5+0))×(4.80/2)+(1+y/2)^(-3.5)×100+(1+y/2)^(-(0.5+1))×(4.80/2)+(1+y/2)^(-(0.5+2))×(4.8/2)+(1+y/2)^(-(0.5+3))×(4.8/2)
    118.28=(1+y/2)^(-(0.5+0))×(6.50/2)+(1+y/2)^(-3.5)×100+(1+y/2)^(-(0.5+1))×(6.50/2)+(1+y/2)^(-(0.5+2))×(6.50/2)+(1+y/2)^(-(0.5+3))×(6.50/2)
    sqrt（(6-t)＾2+4t＾2)=12sqrt5/5
    11693.14952=e^(-y×0.5)×450+e^(-y×1)×450+e^(-y×1.5)×450+e^(-y×2)×450+e^(-y×2.5)×450+e^(-y×3)×450+e^(-y×3)×10000
    11693.14952=e^(-y×0.5)×450+e^(-y×1)×450+e^(-y×1.5)×450+e^(-y×2)×450+e^(-y×2.5)×450+e^(-y×3)×450+e^(-y×3)×1000
    450/e^(4.2%*6/12) +450/e^(4.7%*12/12) +450/e^(5%*18/12) +450/e^(5.6%*24/12) +450/e^(6%*30/12) +450/e^(6.2%*36/12) +1000/e^(6.2%*36/12) =x
    e^(-y×0.5)×450+e^(-y×1)×450+e^(-y×1.5)×450+e^(-y×2)×450+e^(-y×2.5)×450+e^(-y×3)×450+e^(-y×3)×1000=11693.14952
    16x²+176-228x=0
    110+120-2*x=180

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