（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))
    (21.13×7.7×18.40+25×(-56.6))/( 20.34×(6.3+7.7))
    (21.13×7.7×64.2+25×(-56.6))/( 20.34×(6.3+7.7))
    (（19.8×7.7+20×2.1+25×(-56.6)）/( 20.68×(6.3+7.7))
    (（19.8×2.9+20×2.1+25×(-56.6)）/( 20.68×(6.3+7.7))
    (18.71×7.7×18.40+25×(-56.6))/( 20.34×(6.3+7.7))
    (18.71×3.3×18.40+25×(-56.6))/( 20.34×(6.3+7.7))

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