lnx+0.971×ln（101.325-x）=17.545
    10x^3+x^2+x-11=0
    sinx/x=-√2/2
    10x^3-x^2-x-11=0
    x^2=（1.06*10^-3）(0.065-x)
    （x^2-1）/（x^2+x-2）
    x^2=1.06*10^-3(0.065-x)
    4x^3+6x^2-2=0
    x＾2÷（1-x）＾2=1.39
    arctan0.707+arctan1.414=x
    x＾2÷（1-x＾2）=1.39
    arctan1=x
    259t*t-177t+135=0
    arctanx=1
    arctan2x+arctanx=90
    8x3-4x2-4x+1＝0
    (0.0114+2x)^2÷[(0.0043-x)×(0.0143-x)]=7.02
    (0.114+2x)^2÷[(0.0043-x)×(0.0143-x)]=7.02
    0.71x^2-1.7x+1=0
    0.4x^2+0.3x-1=0

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