a^6+18a^4-36a^3+81a^2-324a+324=0
    a^6+18a^4-36a^3+81a^2-324a+324=0
    47％x＋80×72%=（80+X）×58%
    45％x＋80×72%=（80+X）×58%
    45x＋80×72%=（80+X）×58%
    (10000/(1.1*x)) + (20000/((1.1*x)+60)) = 150
    (10000/(1.1*x)) + (20000/((1.1*x)+60)) = 150
    (10000/x) + (20000/(x+60)) = 150
    (10000/x) + (18600/(x+60)) = 150
    5*(x+3)=(X+32)+3
    1 / √x
    （0.00176+x）*x/（0.01-x）=6.23*10^-8
    3x²-12x+10=0
    (x*0.08)+1.5=x
    (x*0.08)+1.5=x
    (x*0.08)+1.5=x
    x*0.08+1.5=x
    x*0.08+1.5=x
    x*0.08+1.5=x
    x*0.08+1.5=x

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