1.5化简下列各式: (1)AUB-A (2)(4UB)(AUB) (3)(AUB)(BUC (4)(4UB)(A∪B)(AUB) 解 反回化简下列各式： (1) (2) (3) (4) A B  A (A B)(A B) (A B)(B  C) (A B)(A B)(A B) 1.5 解答 返回