1/(0.00021)^0.5=7/(x^0.5)
    1/(0.00021)^0.5=7/x^0.5
    7x-5=9
    √4x－x＾2
     x²-2024x+2023 = 0
     x²-2024x+2023 = 0
    （√98-√97）÷x
    45.40023894862605*X+44.86260454002389*X=10000
    16.5×a×0.5=5.5
    1.5x－x＝10
    ln1+x
    x^（-1）
    x-（3353+0.36x）=0
    x-（2853+0.4x）=0
    x-（3853+0.32x）=0
    x^3-3/4x=1/4
    280x＝240（x＋4）
    127676=40/(1+x)^60+1000/(1+x)^60
    （x＋40）＝1.8x
    （x＋100）＝1.8x

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