123/10
    1234/10
    123/10
    91.81128×2.1/0.1
    945.8712+2×164.76+16
    1.2×1.5×1+1.8×2.1×3
    1.8×2.1×1
    0.9×2.1×21+1.8×2.1×6+1.2×2.1×2+0.7×2.1×18
    1.2×1.5×44+0.7×2.1×19+0.7×1.5×1+1.5×1.5×2
    0.9×2.1×21+1.8×2.1×6+1.2×2.1×2+0.7×2.1×18
    1.2×1.5×40+0.7×2.1×19+0.7×1.5×3+1.5×1.5×4
    0.9×2.1×19+1.8×2.1×6+1.2×2.1×2+0.7×2.1×10+1.2×1.5×2
    1.2×1.5×35+0.7×2.1×10+1.8×2.1×4
    6.06×27+(1.56+2.4)×18+3.66+3.9+3.36+59.75+40.8+15.6
    6.06×26+(1.56+2.4)×9+3.66+3.9+(1.86+2.4)×1+3.36+59.75+27.9+4.74+15.6
    15+40.5+19.2+15+15.6+3.6+3.6+3.6+19.8+3.6+3.9+3.6+16.8
    10.14×4.14+7.2×6.54
    1/2:1/5
    1/2(1.38×4.08×9+1.38×3.96×8+3.9×2.28×1+1.38×3.48×1)
    1/2(1.38×4.08×7+1.38×3.96×7+3.9×2.28×1+1.38×4.2×1+1.38×3.48×3)

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