43.85*43.85*1500/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*32*32/3.4*(9-x)*60.35*60.35/43.85/43.85)/(75*1500/3.4*9/(10-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*32*32/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1200/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*32*32/3.4*(9-x)*60.35*60.35/43.85/43.85)/(75*1600/3.4*9/(10-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*32*32/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1600/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*32*32/3.4*(9-x)*60.35*60.35/43.85/43.85)/(75*1600/3.4*9/(10-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*32*32/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1800/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*32*32/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*1800/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*32*32/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1600/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*32*32/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*1600/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*32*32/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1500/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*40*40/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*1500/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*40*40/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1500/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*35*35/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*1500/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*35*35/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1500/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*25*25/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*30*30/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*1500/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*25*25/3.4*x*x/60.35^4+71*2*3.14*30*30/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1500/3.4*(9-2*x)/(9-x)+0.8*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*30*30/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*1500/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*30*30/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1500/3.4*(9-2*x)/(9-x)+1.0*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*30*30/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*1500/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*30*30/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*800/3.4*(9-2*x)/(9-x)+1.0*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*30*30/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*800/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*30*30/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1000/3.4*(9-2*x)/(9-x)+1.0*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*30*30/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*1000/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*30*30/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1200/3.4*(9-2*x)/(9-x)+1.0*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*30*30/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*1200/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*30*30/3.4*(9-x)*(9-x)/43.85^4)=0
    43.85*43.85*1200/3.4*(9-2*x)/(9-x)+1.0*36*(165*2*3.14*20*20/3.4*x*43.85*43.85/60.35/60.35+165*2*3.14*32*32/3.4*(5-x)*60.35*60.35/43.85/43.85)/(75*1200/3.4*9/(9-x)/60.35/60.35+71*165*2*3.14*20*20/3.4*x*x/60.35^4+71*2*3.14*32*32/3.4*(9-x)*(9-x)/43.85^4)=0
    17.77777778+6k=160
    60.35^2*1000/3.4*(9-2*x)/(9-x)+36*1*(165*2*3.1416*40^2/3.4*x*(60.35/43.85)^2+165*2*3.1416*20^2/3.4*(9-x)*(43.85/60.35)^2)/(75*1000/3.4*9/43.85^2/(9-x)+71*165*2*3.1416*40^2/3.4*x^2/43.85^4+71*165*2*3.1416*20^2/3.4*(9-x)^2/60.35^4)=0
    -3l^{2}+20l+100
    60.35^2*600/3.4*(9-2*x)/(9-x)+36*1*(165*2*3.1416*30^2/3.4*x*(60.35/43.85)^2+165*2*3.1416*20^2/3.4*(9-x)*(43.85/60.35)^2)/(75*600/3.4*9/43.85^2/(9-x)+71*165*2*3.1416*30^2/3.4*x^2/43.85^4+71*165*2*3.1416*20^2/3.4*(9-x)^2/60.35^4)=0
    400*180*(5-2*x)/(5-x)+54*(210*900*x*4/9+210*600*(5-x)*9/4)/(75*210*5/900/(5-x)+71*210*900*x*x/30^4+71*210*600*(5-x)*(5-x)/20^4)=0
    400*180*(5-2*x)/(5-x)+54*(180*900*x*4/9+180*600*(5-x)*9/4)/(75*180*5/900/(5-x)+71*180*900*x*x/30^4+71*180*600*(5-x)*(5-x)/20^4)=0

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