归结推理法证明问题A1 = (∃x)(P(x)∧(∀y)(R(x,y)→L(x,y)))A2 = (∀x)(P(x)→(∀y)(Q(y)→┐L(x,y)))B = ┐(∃x)(∀y)(R(y,x)∧Q(x))用归结推理法证明A1∧A2 => B请一定要用归结推理法
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