Cho s=x+y, p=xy. giải hpt: \( x^2+y^2=4 \) \( 2xy=3 \) \( x^2+y^2=20 \) \( 2xy=8 \) \( x^3+y^3=2 \) \( xy(x+y)=2 \) \( x^3+y^3=35 \) \( x^2.y+xy^2=30 \) \( x^3+y^3=8 \) \( x+y+2xy=2 \)

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cho s=x+y, p=xy. giải hpt:

\( x^2+y^2=4 \)
\( 2xy=3 \)

\( x^2+y^2=20 \)
\( 2xy=8 \)

\( x^3+y^3=2 \)
\( xy(x+y)=2 \)

\( x^3+y^3=35 \)
\( x^2.y+xy^2=30 \)

\( x^3+y^3=8 \)
\( x+y+2xy=2 \)