求解一道数学课~已知X+Y=1,求½X²+Xy+½y²的值.
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求解一道数学课~已知X+Y=1,求½X²+Xy+½y²的值.
求解一道数学课~
已知X+Y=1,求½X²+Xy+½y²的值.
求解一道数学课~已知X+Y=1,求½X²+Xy+½y²的值.
½X²+Xy+½y²
=1/2(x²+2xy+y²)
=1/2(x+y)²
=1/2*1²
=1/2