1/2x²+xy+1/2y²=1/2( )=1/2×( )=( )

问题描述:

1/2x²+xy+1/2y²=1/2( )=1/2×( )=( )

1/2x²+xy+1/2y²=1/2(x²+2xy+y²)=1/2×(x+y)²=(x/√2+y/√2)²√是什么意思根号采纳吧