X^(-1)=4
    x*4=1.87
    x*400=1.87
    25x^2-x+9=0
    P*15%=P*(1-5%)-205
    205*P*15%=P*(1-5%)-205
    205P*0.15=0.95P-205
    205*0.15P=0.95P-205
    205*9*25%=P*0.95-205
    30.75P=0.95P-205
    X+3=5
    [（1000*p)+25000]*25%=[1000*p*（1-5%）]-[(1000*50)+25000]
    P*25%=P*(1-5%)-50+25000/1000
    1000*p*25%=1000*p*（1-5%）-1000*50+25000
    （1000*p+25000）*25%=1000*p*（1-5%）-1000*50+25000
    X+1870/2400X=48500
    X+1870/2400X=630500
    66000＝27x-0.0035x^2
    66000＝-0.0035x^2+27x
    66000＝-0.0035x^2-27x

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