(r+17)/(r+59)=23.2/31.6
    （1000000+X）/1.06*0.06*1.12=X
    （1000000+X）/1.06*0.06=1.12X
    x^2=2
    a(-5/6+7/12)+3/2=4/3
    x^2 + 2x + 1 = 0
    x * x + 3 * x - 10 = 0
    0.5x+3.5=3/4x
    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

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