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求解答此题谢谢! 5
2016-12-20 · 知道合伙人教育行家
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(1)
2x²y+2xy²
=2xy(x+y)
=2×1/2×3
=1×3
=3
(2)
x²+y²
=(x+y)²-2xy
=3²-2×1/2
=9-1
=8
2x²y+2xy²
=2xy(x+y)
=2×1/2×3
=1×3
=3
(2)
x²+y²
=(x+y)²-2xy
=3²-2×1/2
=9-1
=8
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