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Vynásob a sečti
Vynásob a sečti:
\large xy \cdot \left( {2 x + 3y} \right) - x \cdot \left \{ {3y \cdot \left( {y- a} \right) - \left[ {{x^{2}} - 2y \cdot \left( {x- y} \right) } \right] } \right \} =
\large = 3axy+{x^{3}} + x{y^{2}}
\large = 2axy+{x^{3}} + 3 x{y^{2}}
\large = 3axy+{x^{3}} + 2 x{y^{2}}
\large = 3axy+{x^{2}} + 2 x{y^{3}}