b+sqrt(b^2-3)>1
    4k^2-1865k-533000<0
    4k^2-1865k-53300<0
    3X+99>16574
    90x+120（50-x）≤4800
    (0.672305*tan(x/2))^(2/5)<0.5
    (1.35/(0.85*(2*9.81)^(1/2)*tan(x/2)*(8/15)))^(2/5)<0.5
    （544*0.000539176*3888.9*V^2+0.41*928*544+520*0.000539176*9074.1^3*V^2/(720*V-3888.9)^2)/10000＜140.14
    （544*0.000539176*2592.6*V^2+0.41*928*544+520*0.000539176*10370.4^3*V^2/(720*V-2592.6)^2)/10000＜139.6
    （544*0.000539176*1568*V^2+0.41*928*544+520*0.000539176*11395^3*V^2/(720*V-1568)^2)/10000＜139.2
    （560*0.000539176*1568*V^2+0.41*928*560+300*0.000539176*11395^3*V^2/(720*V-1568)^2)/10000＜96.38
    （500*0.000539176*1568*V^2+0.41*928*500+300*0.000539176*11395^3*V^2/(720*V-1568)^2)/10000＜92.45
    （500*0.000539176*1568*V^2+0.41*928*500+430*0.000539176*11395^3*V^2/(720*V-1568)^2)/10000＜118.33
    （544*0.000539176*1568*V^2+0.41*928*544+510*0.000539176*11395^3*V^2/(720*V-1568)^2)/10000＜137.14
    （544*0.000539176*1568*V^2+0.41*928*544+500*0.000539176*11395^3*V^2/(720*V-1568)^2)/10000＜135.14
    （544*0.000539176*1568*V^2+0.41*928*544+530*0.000539176*11395^3*V^2/(720*V-1568)^2)/10000＜141.12
    （544*0.000539176*5185.2*V^2+0.41*928*544+520*0.000539176*7777.8^3*V^2/(720*V-5185.2)^2)/10000 <140.683
    （544*0.000539176*3888.9*V^2+0.41*928*544+520*0.000539176*9074.1^3*V^2/(720*V-3888.9)^2)/10000 <140.14
    （544*0.000539176*2592.6*V^2+0.41*928*544+520*0.000539176*10370.4^3*V^2/(720*V-2592.6)^2)/10000 <139.6
    （544*0.000539176*2592.6*V^2+0.41*928*544+520*0.000539176*10370.4^3*V^2/(720*V-2592.6)^2)/10000 <145

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