计算56-1/2[(3a+2b)-(a-2b+2)]

问题描述:

计算56-1/2[(3a+2b)-(a-2b+2)]

56-1/2[(3a+2b)-(a-2b+2)]
=56-1/2(2a+4b-2)
=56-a-2b+1
=57-a-2b