1/x+30/15x=1.5
    -x^2lnx
    arctan0.25x-arctan0.01x-360=0
    3x+24=5x+23
    x^2+1000x-3*10^7=0
    e^x-1/x=0
    300000/x=300000/(x+1000)+10
    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

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