43.85^2*4000/3.4*(9-2*x)/(9-x)+36*1.5*(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*4000/3.4*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)
    43.85^2*2000/3.4*(9-2*x)/(9-x)+36*1.5*(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*2000/3.4*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)
    43.85^2*500/3.4*(9-2*x)/(9-x)+36*1.5*(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)
    43.85^2*1000/3.4*(9-2*x)/(9-x)+36*1.5*(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*1000/3.4*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)
    （25.697+x）×2.55＝51.393+69.89-x
    （25.697+x）×2.35＝51.393+69.89-x
    （25.697+x）×2.15＝51.393+69.89-x
    （25.697+x）×1.95＝51.393+69.89-x
    （25.697+x）×1.75＝51.393+69.89-x
    （25.697+x）×1.55＝51.393+69.89-x
    43.85^2*1200/3.4*(9-2*x)/(9-x)+36*2.8*(165*2*3.14159*40^2/4/3.4*x*(43.85/60.35)^2+165*2*3.14159*60^2/4/3.4*(9-x)*(60.35/43.85)^2)/(75*1200/3.4*x/60.35^2/(9-x)+71*165*2*3.14159*40^2/4/3.4*x^2/60.35^4+71*165*2*3.14159*60^2/4/3.4*(9-x)^2/43.85^4)
    11*（1-x）=5
    11*（1-x）=5
    2.2/87-40/1650-10/125+X/131=0.00167（X+52.2)
    10x*1.5+40x=1350
    400*180*(5-2*x)/(5-x)+54*(180*900*x*400/900+180*600*(5-x)*9/4)/(75*180*5/900/(5-x)+71*180*900*x^2/30^4+71*180*600*(5-x)^2/20^4)=0
    （25984.14-X/1.01*0.01）*1.12 = 302108.91-X
    （25984.14-X/1.01*0.01）*1.12=314696.78-X
    (X-X/1.09*0.03)*0.02=20422.02
    (X-X/1.09*0.03)*0.02=53972.49

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