(6x^2+x^3)/(2+x)^3
    x*(1-2^10)/(1-2)＝1024
    x*(1-2^10)/(1-2)
    13.61=0.49^2*(0.49^2-x^2)/(0.49^2-x^2-x^3)
    x-x/1.09*0.03=10159415
    0.95=3x^2+2x^3
    （x^4）-2(x^2)-16x-3=0
    x^5-17x^3+5x^2+3=0
    1*2X-1*（3X/2）=15
    1*2X-1*（2/3X）=15
    [-sqrt(3)*(x-1)]^2=4x
    y^2+4sqrt(3)y/3-4=0
    12614.06*（1+x）^10=20000
    2x^5-72x^3+13x^4-36*14x^2+18*18*4=0
    2x^5-72x^3+13x^4-36*14x^2+18*18*4=0
    0.98x➗3800=112➗160
    156.8x=452600
    700/x=900/(x+20)
    700/x=900/x+20
    x/700=x+20/900

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