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鶏はXのみを設定し、その後、ウサギは(20-X)のみを持っています. 2X+4(20-X)=54,X=13, 20-13=7(のみ)すなわち鶏13匹,ウサギ7匹. いくつかの方法があります。 楼主参考: これは小学校の教案です
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