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Find "a" the identity element and "b" inverse for the operation defined as "a*b=a+b+2"星号不是乘号····

分类: 作业答案 • 2021-12-18 17:09:17

问题描述：

Find "a" the identity element and "b" inverse for the operation defined as "a*b=a+b+2"星号不是乘号····

答

令a+b+2=a得b=-2,所以-2是单位元
ab=a+b+2=-2,b=-4-a,所以a的逆元为-4-a