[(A-1/2)^2-(A+1/2)](A+3) 计算
问题描述:
[(A-1/2)^2-(A+1/2)](A+3) 计算
答
(A+1/2)这个也有平方吧
原式=[(A-1/2+A+1/2)(A-1/2-A-1/2)]/(A+3)
=-2A/(A+3)