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解設兔有x只,所以雞脚有20-4x只,雞有(20-4x)÷2只. 1當兔有1只,雞有(20-4×1)÷2=8只 2當兔有2只,雞有(20-4×2)÷2=6只 3當兔有3只,雞有(20-4×3)÷2=4只 4當兔有4只,雞有(20-4×4)÷2=2只
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