4.8X = 1.2 + 2.4X
    1x=1
    -x^2+13x-135/4＝9/16x
    (x+16 /5)^2=（24/5）^2+(8-x)^2
    (x+16 /5)^2=（24/5）^2
    55x^2+11000x=687.5*1000
    3.2x＾2-8x+5=0
    G=1000exp(-(G-1)/10)
    sinx-cosx
    0.000001x-sinx
    0.001x-sinx
    0.5x-sinx
    0.3x-sinx
    0.1x-sinx
    x^3+3x^2-2
    x^4-3
    x^2-2
    0.01x-sinx
    0.01x-sinx=0
    x^x-2=0

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