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ニワトリには16本の足がある 4本の足はウサギ、2匹のウサギ、6羽の鶏 式2X8=16 20-16=4 4/2=2 8-2=6 方程式: 鶏xを8-xに設定 2x+4(8-x)=20 解得x=6 8-x
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