1/2x²+xy+1/2y²=1/2( )=1/2×( )=( )

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1/2x²+xy+1/2y²=1/2( )=1/2×( )=( )
1/2x²+xy+1/2y²=1/2( )=1/2×( )=( )

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