X^2+3X+1＝0
    5X^2-4X-12＝0
    0.6+2X＝1.4-3X
    3x+4x=96
    x^2/（1-x）^3=400
    400t^3-t^2+1=0
    400t^3-t^2+1=0
    n*(n-1)=210
    x＾2＝9/6
    4x^2/(10-x)*(1-x)=8100
    4x^2/(10-x)*(1-x)=8100
    4x^2/(10-x)*(1-x)=8100
    4x^2/(10-x)*(1-x)=8100
    4x^2/(10-x)(1-x)=8100
    4x^2/(10-x)(1-x)=8100
    4x^2/(10-x)(1-x)=8100
    x²＋20x＋120=0
    4x^2/(1-x)^2=8100
    2x/(1-x)^2=8100
    2x/(1-x)^2

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