计算：5a-6[a-(a+1)/3]
问题描述：
计算：5a-6[a-(a+1)/3]
答
5a-6[a-(a+1)/3]
=5a-6[a-(a/3+1/3)]
=5a-6[a-a/3-1/3]
=5a-[6a-6*a/3-6*1/3]
=5a-[6a-2a-2]
=5a-6a+2a+2
=a+2