295.324/0.75/(1457.166*500*1.815014254472)
    295.324/0.7/(1457.166*500*1.815014254472)
    0.55*(50*208.462*1457.166*(1.815014254472/(1+1.815014254472))）+330.212
    0.55*(50*208.462*1457.166*(1.815014254472/(1+1.815014254472))+330.212)
    0.55*(50*208.462*1457.166*(cos(28.853)/sin(28.853)/(1+cos(28.853)/sin(28.853)))+330.212
    (40*0.0179-0.35^2)*(1-3245.022/(6490.044+4004))^(4/3)*(2*1619.073/1800-1)
    1.2*(7.55/8.209)^(2/3)*(1-3245.022/(2*(6490.044+4004)))*1800/1619.073
    1.2*(8.209/29.53)^(2/3)*(1-3245.022/(2*(6490.044+4004)))*1800/1619.073
    3.548*0.5^2.4+1.373
    1/(2*0.0179^(1/2))*(8.209/29.53)^(1/3)*(1+(125*0.0179+0.1)*0.5^1.2)
    1/(2*0.0179^(1/2))*(8.209/2953)^(1/3)*(1+(125*0.0179+0.1)*0.5^1.2)
    5/384*(66.125-49)*26^4/(32.8*8.209*10^10)
    7.55*10^10/(1-7.55*10^10/(295.3*10^9)*(1160.213/2070.25)^2)
    a^3+10a^2+25a+15=0
    8e^2-16e+1=0
    8e3-4e+4=0
    (238+374)/6
    m^3-2m^2-3
    1606938044258990275541962092341162602522202993782792835301376*1606938044258990275541962092341162602522202993782792835301376
    9x+4(100-x) = [10x+6(100-x)](1-0.25)

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