x+y=1,则代数式1/2x²+xy+1/2y²的值是
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x+y=1,则代数式1/2x²+xy+1/2y²的值是
x+y=1,则代数式1/2x²+xy+1/2y²的值是
x+y=1,则代数式1/2x²+xy+1/2y²的值是
1/2*x^2+xy+1/2*y^2
=1/2*(x^2+2xy+y^2)
=1/2*(x+y)^2
=1/2*1
=1/2 .