（1/2+1/3）÷2/5-2/3
    （4/5+1/4）÷7/3+7/10
    0.5*2.4
    1×9.6×1300×100×(210-0.5×100)
    0.55×26.23×3.000
    0.55×26.23×3.050
    0.50×26.23×3.050
    -26.23×3×3/16
    -26.23×3.050×3.050/11
    -26.23×3.050×3.050/14
    -26.23×3.050×3.050/24
    -26.23×3.0502×3.050/16
    -26.23×3.0502×3.050/11
    -26.23×3.0502×3.050/14
    -26.23×3.0502×3.050/24
    -26.23×3.0502/24
    (169.5×7.4+307.054×3.3+66.8×0.66)-(14.672×1.59+210.38×0.7+193.191×7.49+109.24×5.19)
    (169.5×7.4+307.054×3.3+66.8×0.66)-(14.672×1.59+210.38×0.65+193.191×7.49+109.24×5.19
    (169.5×7.44+307.054×3+66.8×0.66)-(14.672×1.59+210.38×0.65+193.191×7.49+109.24×5.19)
    (169.5×7.44+307.054×3.3+66.8×0.66)-(14.672×1.59+210.38×0.65+193.191×7.49+109.24×5.19)

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