化简3a-[2a-(2b-c)]=b并求当a+b=5 c=4时的值
问题描述:
化简3a-[2a-(2b-c)]=b并求当a+b=5 c=4时的值
答
3a-[2a-(2b-c)]-b
=3a-2a+(2b-c)-b
=a+b-c
=5-4
=1