0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.99
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.8884
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.5923
    0.137X^-3+0.119X^-2+0.269X^-1-0.019=0.44
    0.137X^-3+0.119X^-2+0.269X^-1-0.019=0.9872
    0.137X^-3+0.119X^-2+0.269X^-1-0.019=0.89
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.44
    x^2-9x+16=0
    x^3+2x^2+2x=0
    2x^3+11x^2+20x+8
    50+（50X0.2）=X
    (2x-2)/㏑x
    1.6(1+x)²＝2.5
    2*x*x*x-x*x-1＝0
    e^x+sinx=4
    x(x-1)=240
    [2000（1-x）-1000]（1+x）=1107.45
    a^2-140a+6100 = 0
    （360-280-x）（60+5x）=7200
    x^2-140x+6100＝0

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