2500+x^2=（2500-x）^2
    500+x=2500-x
    1/7.5+1/5X=1
    1/7.5+1/5X=1
    1/7.5+1/5X=1
    1/7.5+1/5X=1
    500+x=2500-x
    2500-x=500+x
    500^2+x^2=（2500-x）^2
    500^2+x^2=2500^2-x^2
     2.4%-2.5%+2.4%x(-2.5%)
    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

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