X^2+4x+1
    9x^2-7x-22
    9x^2-14x+48
    （x-7）*(9x-4)
    27x^2-129x+84=0
    4*（12.5a）^2+60*12.5a+900=1225*a^2
    x^2-x+1=0
    x²-1.5x-9
    x*1/ex
    7x^2-28x+1=0
    sqrt((6800+x)^2+x^2)-(6800+x)=52.1
    sqrt((6800+x)^2+x^)-(6800+x)=52.1
    10X-X=32.13
    5x6
    -0.5x²＋36x－650＝0
    x²－72x＋1280
    -11/3+x＝(2+16/9-x)*(2+16/9-x)-4*(2+16/9-x)+3
    -11/3+x＝(16/9-x)*(16/9-x)-4*(16/9-x)+3
    -0.13*x+0.45*x=39000
    （20-x）（99+10x）=1980

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