我是初学者，想请教下这么写对不对 1. All the apples are not for Mary. 2. Every student knows some ugly singer. 1：～∀x(A(x)→F(x,m)) 或者∀x(A(x)→~F(x,m)) Key: A(x): x is an apple; F(x,y): x is for y;m:Mary 2: ∀x&

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