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

3a-[2a-(2b-c)]-b
=3a-2a+(2b-c)-b
=a+b-c
=5-4
=1