8.314*453/1.013-78*(1000/453)^2.4
    tan56
    (4000+98000+13500+8000)/2500
    0.5*(1.90*56.73+(1.90+4.25)*96.86+(4.25+2.89)*158.36+2.89*127.37)
    0.5*(1.82*55.48+(1.82+4.15)*96.86+(4.15+2.81)*158.36+2.81*126.43)
    0.5*(1.72*53.63+(1.72+4.04)*97.05+(4.04+2.71)*158.36+2.71*124.26)
    0.5*(1.72*53.44+(1.72+4.04)*97.05+(4.04+2.71)*158.36+2.71*124.34)
    0.5*(1.72*53.44+(1.72+4.04)*97.05+(4.04+2.71)*158.29+2.71*124.34)
    0.5*(1.72*62.17+(1.72+4.04)*97.05+(4.04+2.71)*158.29+2.71*131.67)
    e^21.058
    12×7×165
    3-8^0.5
    2643.95*6.15/2/9.8/0.36/(809-0.52-3*8.87)
    5641651.653/5613651+894165419865 654698534315.2=x
    0.00000389333+0.000660697*124403960870754/265684920585727
    0.00000531333+0.000558152*60331185759173/177542866954261
    0.15*180+180*180*0.0025
    0.15*540+540*540*0.0025
    3*10^(-6)*(((60.91^2-2.17^2)/38.4)+2.16*10^(-9)*(60.91-2.17)*33/0.8
    3*10^(-6)*(((75.91^2-6.03^2)/40.4)+2.16*10^(-9)*(75.91-6.03)*33/0.8

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