x*25/30-x*0.1=15.67
    2*10^（-7）X^3+0.0011X^2+2.2957X+1254.6=0
    2x^2+2x+1
    （1-x^10）/（1-x）=5775
    x^2-14x+48=0
    abs(x-2)*(e^x)
    54x=81+5x^2
    5x^2+6x=144
    （x^3+4）/(x^2)
    -x^2+260x-16500=0
    x^2-260x+16500=0
    x^3-260x+16500=0
    x^3-6*x^2+12*x-27=0
    x^3-6*x^2+12*x-27
    x^3-6x^2+12x-27
    x²-3√3×√35x/7+4＝0
    6x*x-6x-1
    6.45*6.45*9=x^2+9x
    300x-x=2800000+150x
    arctanx+2*arctan（2*x）=180

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