29y-36（69.9-y）=0
    (X+200)*(X+200)-x*x=200000
    x = (3*sqrt(11)+38)/5
    10x(1+x)^5+10x(1+x)^4+10x(1+x)^3=20000
    （25.697+x）×0.85＝51.393+67.89-x
    （25.697+x）×0.85＝51.393+68.89-x
    （25.697+x）×0.85＝51.393+69.89-x
    （25.697+x）×0.85＝51.393+70.89-x
    （25.697+x）×0.85＝51.393+71.89-x
    598.794a-2.091*1.3*a*a/2=1197.456
    598.794a-1.138*1.3a*a=1197.456
    598 794a-1.138*1.3a^2=1197.456
    80（6.5-3x）²＝1000x
    80（6.5-3x）＝1000x
    x×2.75＝152.89-x
    x×2.55＝152.89-x
    x×2.35＝152.89-x
    x×2.15＝152.89-x
    x×1.95＝152.89-x
    x×1.75＝152.89-x

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