化简:(a+8)/2-4
问题描述:
化简:(a+8)/2-4
(2) (a+b)/2-b/2
答
(a+8)/2-4
=(a+8)/2-8/2
=(a+8-8)/2
=a/2
(a+b)/2-b/2
=(a+b-b)/2
=a/2