2÷5/4*4/5
    5/8*16
     sqrt(1:2)*63.0105*4.4555-(1:2)*10*4.4555*4.4555
     sqrt(1:2)*45.365*3.208-(1:2)*10*3.208*3.208
    6÷6/7
    sqrt(1:2)*45.365*4.4555039-(1:2)*10*4.4555039*4.555039
    63.01036:sqrt(2)
    sqrt(1/2)*45.365*3.207789-(1/2)*10*3.207789*3.207789
    45.365:sqrt(2):10
    sqrt(3970.305399)
    sqrt(2057.977)
    (-298400-20*sqrt(22401400))/(-99)
    (-298400+20*sqrt(22401400))/(-99)
    0.747×4/3
    23-18
    （（20×1.9+19.1×2.8）×2.72+2×5.8×1.65
    3.14×0.82×((16.9-0.5)-6.9)/ln( 1+2.3/35.7)+( 11.65-1.5)/（1.5ln( 1+0.2 11.65/35.7))
    2×10√(0.89×16.9)
    16.9/(0.7/0.03456+3.4/(5.72×10-4)+0.8/(4.6×10-4) +4.1/(1.74×10-4) +1/(1.73×10-4) +1.6/(8.003×10-4) +5.3/(8.004×10-4))
    16.9/(0.7/0.03456+3.4/(5.72×10-4)+0.8/(4.6×10-4) +4.1/(1.74×10-4) +1/(1.73×10-4) +1.6/(0.003×10-4) +5.3/(0.004×10-4))

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