0.0016-0.16*x+4*x*x+4*x*x=0.16*x*x
    e/e＾(x-1)
    1053a^4-831a^2+98=0
    x^2-2x-1=0
    x^2-2x+5=0
    225a^6-7209a^4+5208a^2-784=0
     -0.1236x^2+1.8948x-6.396 = 0
    1/x+1/（x+15）=1/4
    225a^6-7209a^4+5208a^2-784=0
    x^5+10x^3+20x-1=0
    (x-1.8)^2+1.6^2=x^2
    (x-1.8)^2+1.6^2=x
    225a^3-7929a^4+5208a^2-784=0
    225a^6-7929a^4+5208a^2-784=0
    -0.0564x^2+1.1292x-5.2178 = 0
    -0.048x^2+0.984x-4.6132=0
    -0.00564x^2+1.128x-5.1612=0
    -0.2184x^2+3.4698x-12.19=0
    -0.1128x^2+1.8282x-6.8248=0
    0.1536x^2-1.7064x+3.8738=0

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