问答题
试问在Q中,a*b=ab/2的二元运算是否满足交换律,是否满足结合律?
问答题试问在Q中,a*b=ab/2的二元运算是否满足交换律,是否满足结合律?
试问在Q中,a*b=ab+1的二元运算是否满足交换律,是否满足结合律?
问答题试问在Q中,a*b=ab+1的二元运算是否满足交换律,是否满足结合律?
试问在Z中,a*b=a-b的二元运算是否满足交换律,是否满足结合律?
问答题试问在Z中,a*b=a-b的二元运算是否满足交换律,是否满足结合律?