计算:2/3A-2/A+B{A+B/3A-(A+B)}等于多少?

问题描述:

计算:2/3A-2/A+B{A+B/3A-(A+B)}等于多少?

2/3A-2/(A+B){(A+B)/3A-(A+B)}
=2/3A-2/3A+2
=2