已知x+y=2,则1/2x²+xy+1/2y²

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已知x+y=2,则1/2x²+xy+1/2y²
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已知x+y=2,则1/2x²+xy+1/2y²
已知x+y=2,则1/2x²+xy+1/2y²

已知x+y=2,则1/2x²+xy+1/2y²
原式=1/2(x²+2xy+y²)
=1/2(x+y)²
=1/2×2²
=2

原式=1/2(x²+2xy+y²)
=1/2(x+y)²
=1/2×2²
=2

1/2x^2+xy+1/2y^2
=1/2(x^2+2xy+y^2)
=1/2(x+y)^2
=1/2*2^2
=2