2×10√(0.82×16.9)
    16.9/(0.7/0.03456+3.4/(5.72×10-4)+0.8/(4.6×10-4) +4.1/(6.74×10-4) +1/(6.73×10-4) +1.6/(8.3×10-4) +5.3/(10.4×10-4))
    (16.9-0.5+6.9)/2
    (6.1×22)/ (6.8×10)
    (6.9×22)/ (6.8×10)
    (5×22)/ (6.8×10)
     （7×22）/（6.8×10）
     （7×22）/（6.8×1000）
     7×22/6.8×1000
     7×22/6.8×10
    （20×1.9+19.1×5.7+21×1.1）×2.66+2×30×1.63
    （20×1.9+19.1×5.7）×2.66+2×30×1.63
    （20×1.9+19.1×5.7）×2.72+2×5.8×1.65
    （20×1.9）×2.72+2×5.8×1.65
    （20×1.9）×2.30+2×41.7×1.52
    （20+18.5×1.2+20×6+19.1×5.7+21×1.1）×0.38-2×30.0×0.61
    （20+18.5×1.2+20×6+19.1×5.7）×0.38-2×30.0×0.61
    （20+18.5×1.2+20×6）×0.37-2×5.8×0.61
    (23.38×7.7×64.2+25×(-56.6)）/( 20.68×(6.3+7.7))
    (22.12×7.7×64.2+25×(-56.6))/( 20.79×(6.3+7.7))

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