（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))
    (（18.71×7.7×64.2+25×（-56.6））/(18.90×（6.3+7.7))
    (（19.8×1.3+20×2.5+22×1.8+24×1.2）×56.6)/(18.90+（6.3+7.7))
    (（19.8×1.3+20×2.5+22×1.8+24×1.2）×56.6)/(18.90+（6.3+14))=
    (19.8×1.3+20×2.5+22×1.8+24×1.2)/7.7
    (355.64×10^3)/(0.856×97.48×102 )
    124.45+191.25+39.94
    0.1×35.51×1.25×0.9×10
    124.45+191.25+68.96
    0.1×61.3×1.25×0.9×10

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