Mathematics
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    300*(80%+75%-1)
    47/49*13/14+3*3/14*8/49
    180-90-arctan(0.5√20)-arctan(0.1√20)
    4^2/3
    16*(3/5)
    3*(5/6)
    3*(6/5)
    131313/313131*65
    (1102.97×10^3×1393.48-1.0×14.3×800×96.41×(740-96.41/2))/(360×(740-60))
    (1102.97×10^3)/(1.0×14.3×800)
    (1132.54×10^3)/1102.97+26.67
    (1102.97×10^3)/(1.0×14.3×800×740)
    1+1/((1300×((1020.31×10^3)/1102.97+26.67))/740)×(11000/800)^2×1.0
    (0.5×14.3×800×800)/(1102.97×10^3 )
    ((1+1)(1+1))
    (5*62+1*12+3*2)/76
    (5*44+1*5+3*2)/51
    (5*38+1*1+3*1)/(38+2)
    (5*44+1*5+3*2)/(51+2)=
    (5*38+1*1+3*1)/(40+2)

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