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
    110+120+2*x=180
    x^2+2x+1=1
    2（2-2x）=x²
    500(1+x)＾2=7200
    air purifier
    x^3-3x^2+8x-4=0
    2（x+2）^2-8=0
    x+ln(x+1)
    x^x＝e
    3x^2 + 2x - 5
    2x^2 + 3x - 4
    16.3=（（（100x-55）/45）^2）*16.5
    16.3=（（（100x-55）/45）^2）*16.6
    16.3=（（（100x-55）/45）^2）*16.4
    x^2 + 4x + 4 = 0

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