60.35*60.35*400/3.4*(9-2*x)/(9-x)+1.2*36*(165*2*3.14*30^2/3.4*x*60.35^2/43.85^2+165*2*3.14*25*20/3.4*(9-x)*43.85^2/60.35^2)/(75*450/3.4*9/(9-x)/60.35^2+71*165*2*3.14*30^2/3.4*x^2/43.85^4+71*2*3.14*20^2/3.4*(9-x)^2/60.35^4) = 0
    60.35*60.35*450/3.4*(9-2*x)/(9-x)+1.2*36*(165*2*3.14*30^2/3.4*x*60.35^2/43.85^2+165*2*3.14*25*25/3.4*(9-x)*43.85^2/60.35^2)/(75*450/3.4*9/(9-x)/60.35^2+71*165*2*3.14*30^2/3.4*x^2/43.85^4+71*2*3.14*25^2/3.4*(9-x)^2/60.35^4) = 0
    60.35*60.35*450/3.4*(9-2*x)/(9-x)+1.2*36*(165*2*3.14*30^2/3.4*x*60.35^2/43.85^2+165*2*3.14*20*20/3.4*(9-x)*43.85^2/60.35^2)/(75*450/3.4*9/(9-x)/60.35^2+71*165*2*3.14*30^2/3.4*x^2/43.85^4+71*2*3.14*20^2/3.4*(9-x)^2/60.35^4) = 0
    60.35*60.35*550/3.4*(9-2*x)/(9-x)+1*36*(165*2*3.14*30^2/3.4*x*60.35^2/43.85^2+165*2*3.14*20*20/3.4*(9-x)*43.85^2/60.35^2)/(75*450/3.4*9/(9-x)/60.35^2+71*165*2*3.14*30^2/3.4*x^2/43.85^4+71*2*3.14*20^2/3.4*(9-x)^2/60.35^4) = 0
    60.35*60.35*500/3.4*(9-2*x)/(9-x)+1*36*(165*2*3.14*30^2/3.4*x*60.35^2/43.85^2+165*2*3.14*20*20/3.4*(9-x)*43.85^2/60.35^2)/(75*450/3.4*9/(9-x)/60.35^2+71*165*2*3.14*30^2/3.4*x^2/43.85^4+71*2*3.14*20^2/3.4*(9-x)^2/60.35^4) = 0
    60.35*60.35*400/3.4*(9-2*x)/(9-x)+1*36*(165*2*3.14*30^2/3.4*x*60.35^2/43.85^2+165*2*3.14*20*20/3.4*(9-x)*43.85^2/60.35^2)/(75*450/3.4*9/(9-x)/60.35^2+71*165*2*3.14*30^2/3.4*x^2/43.85^4+71*2*3.14*20^2/3.4*(9-x)^2/60.35^4) = 0
    60.35*60.35*450/3.4*(9-2*x)/(9-x)+1*36*(165*2*3.14*30^2/3.4*x*60.35^2/43.85^2+165*2*3.14*20*20/3.4*(9-x)*43.85^2/60.35^2)/(75*450/3.4*9/(9-x)/60.35^2+71*165*2*3.14*30^2/3.4*x^2/43.85^4+71*2*3.14*20^2/3.4*(9-x)^2/60.35^4) = 0
    60.35*60.35*500/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*30^2/3.4*x*60.35^2/43.85^2+165*2*3.14*20*20/3.4*(9-x)*43.85^2/60.35^2)/(75*450/3.4*9/(9-x)/60.35^2+71*165*2*3.14*30^2/3.4*x^2/43.85^4+71*2*3.14*20^2/3.4*(9-x)^2/60.35^4) = 0
    43.85^2*500/3.4*(9-2*x)/(9-x)+36*1*(165*2*3.1416*40^2/4/3.4*x*(43.85/60.35)^2+165*2*3.1416*60^2/4/3.4*(9-x)*(60.35/43.85)^2)/(75*500/3.4*9/60.35^2/(9-x)+71*165*2*3.1416*40^2/4/3.4*x^2/60.35^4+71*165*2*3.1416*60^2/4/3.4*(9-x)^2/43.85^4)
    X×2.95＝166.536-x
    X×2.75＝166.536-x
    X×2.55＝166.536-x
    X×2.35＝166.536-x
    X×2.15＝166.536-x
    X×1.95＝166.536-x
    1.75×10^-6-1.75×10^-5x=x^2
    -x²+x
    x+5√（4-x）+8=0
    x+5√4-x+8=0
    224*(1-r^11)/(1-r)-224=1736.72

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