6=-0.02X×X+0.6X
    x*x+4*x-12=0
    n＾2+3n=3972
    X-X*0.05=736433.68
    X-X*0.05=736433.68
    30+t=50t-0.5t^2
    x²=-1
    3050000*(1-1.56%)-83459.77-(3050000/1.09*0.09-92026.99-15879.32/1.13*0.13-X/1.03*0.03)*1.12-1397448.34 = X
    3050000*(1-1.56%)-83459.77-(3050000/1.09*0.09-92026.99-15879.32/1.13*0.13-X/1.03*0.03)*1.12=X
    4000000*（1-2.06%）-（4000000/1.09*0.09-x/1.03*0.03）*1.12=x
    (0.05)^n = 0
    (n+1)^2-1=399
    26=X+(X-6)*0.25
    8.4t-4.9t^2＝-4.8
    8.4t-4.9t^2＝-10
    x^6-14x^4+49*11=0
    0.1x+x=98
    203921.67+X/3=114709.90*3+（1613400-X）/14*3
    203921.67+X/3=114709.90*3+（1613400-X）*3
    203921.67+X/3=（114709.90+（1613400-X））*3/14

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