195/8*3.93/2.59
    6.03*8*15.06/34.85
    6.03*8*34.85/15.06
    1/(398804)^0.5
    0.5/(199402)^0.5
     0.4/1.003*10^6
    0.2/1.003*10^6
    0.5(19880.72)^(-0.5)
    20+25+30+35+40+......+515
    9.1+9.2+9.3+8.9+8.8+8.7+ (5.6×9.6×10.6) ÷(2.8×4.8×5.3)=
    9.1+9.2+9.3+8.9+8.8+8.7+ (5.6×9.6×10.6) -(2.8×4.8×5.3)=
    (2.89+0.44)*tan34/(2.5*tan34.07)
    -2.5*cos53.72*cos34.07+2.5*cos34.07*sin53.72
    2.5*cos53.72*cos34.07+2.5*cos34.07*sin53.72
    115.24*2*tan45/(2tan45.2)
    115.24*2*tan45/(sin77.3*tan45.2)
     -cos53.72*2.5*cos34+sin53.72*2.5*cos34
    cos53.72*2.5*cos34+sin53.72*2.5*cos34
    600×48.33%/12
    （1280-300-400）/（1500-300）×100%

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