0.4412*(1-x*x）^2=x
    11/19-(x-6)＝6
    80％(x-6)÷x＝8/11
    80％(x-6)＝8/11x
    0.766*(1-x*x）^2=x
    x^3-3x^2-18=0
    0.5123*(1-x*x）^2=x
    x+1=e^x
    arccos X=0.725
    （x+1）*e^x
    -0.956=x/(1-x*x）^2
    x=－0.954*(1-x*x）^2
    x=(x+12000)/1.06*0.06*1.12
    x=(x+186299.76)/1.06*0.06*1.12
    （1+x）^10=5
    3^（1－x）
    x=(x+6400)/1.06*0.06*1.12
    x = (x+12000)/1.06*0.06*1.12
    5:x=18:26
    x=(x+4000)/1.06*0.06*1.12

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