(（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
    (403.64×103)/(0.856×97.48×102 )
    141.33+225+37.31
    0.1×33.17×1.25×0.9×10
    1/2×33.17×9×1.25×0.9
    (267630×346.04-1×14.3×550×34.02×（515-0.5×34.02）)/(360×（515-35）
    1. 07×99.11+0.5×550-35
     267630/ (1×14.30×550)

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