e^x-1/x=0
    300000/x=300000/(x+1000)+10
    -x=(1+X)
    log（3，absX+1）
    X²+95X-15300=0
    x/(sqrt（x+1）+1)=1/20
    x/（2-x）=1/20
    a×a=8
    -m^2+3m=5/4
    (0.8x/273.4209)^2.519+(0.81x/227.54)^2.011=1
    (0.8x/262.43.09)^2.519+(0.81x/238.54)^2.011=1
    (0.8x/262.43.09)^2.519+(0.81x/238.54)^2.011=1
    (0.8x/264.09)^2.519+(0.81x/219.24)^2.011=1
    (0.8x/264.09)^2.519+(0.81x/219.24)^2.011=1
    a^4+a^3+a^2+a+1=0
    0.2+(0.81x/113)+(x-0.1484)^2/370^2+(0.8x-0.170)^2/27^2 = 1
    0.2+(0.81x/105)+(x-0.1484)^2/504^2+(0.8x-0.170)^2/40^2 = 1
    0.2+(0.81x/133.56)+(x-0.1484)^2/401^2+(0.8x-0.170)^2/31^2=1
    0.2+(0.81x/133.56)+(x-0.1484)^2/401^2+(0.8x-0.170)^2/35^2=1
    0.2+(0.81x/133.56)+(x-0.1484)^2/401^2+(0.8x-0.170)^2/29.9^2=1

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