2a+1=2
    2x+1=1
    (a^2+a+1)/(a^2-a-1)=(a^2-a+2)/(a^2+a-2)
    (a^2+a+1)/(a^2-a-1)=(a^2-a+2)/(a^2+a-2)
    (a^2+a+1)/(a^2-a-1)=(a^2-a+2)/(a^2+a-2)
    (a^2+a+1)/(a^2-a-1)=(a^2-a+2)/(a^2+a-2)
    (a^2+a+1)/(a^2-a-1)=(a^2-a+2)/(a^2+a-2)
    x+1.25*（0.14-x）=0.15
    x+1.25*x=0.15
    -7x^2+160x-544
    25100/(x+22.4)＝150
    25100/(x+22.4)＝100
    3500/x+10000/(x+22.4)+10000/x＝150
    12x^2-12x
    x²=4
    （X+800/12)48+X240+(X-800/12)41=272834
    x^3-4*x^2-1
    0.019*x^2 = 2989.657+14.2367*e^(0.00023725*x)
    (x－40)×(1500－20x)＝0
    x²+1.6x＝1

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