2.4%-2.5%+2.4%x(-2.5%)
     (1+x)^10 = 1.3089
    2.4%-2.5%+2.4%x2.5%
    （8x－12）^2/（4－4x）^2+（4－4x）^2+（8x－12）^2=25/27
    0.025x²-0.75x+2=0
    -27*x^5+273.375*x^4-1374.13*x^3+4079.62*x^2-6975.51*x+5514.71=0
    (101x-7100)(-10x+700)＝7900
    (t+3)*4/2=0.5*(t+5+√(t²+6t+25))
    0.08x²＋0.9x＝1
    x/1+x
    18x(x+2)^2=4(2x+1)^4
    x＾2＝25-5x
    2m²-2m-1=0
    2m²-2m-1=0
    x×（x＋5）＝25
    x＾2＋5x＝25
    x＾2＋5x＝25
    x＾2＋5x＝25
    x^3+x=1
    x^5+x=1

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