Odpowiedź:
s ( x , y ) = (- 7 x y² + x y + 6 x² ) + ( 3 x² y -2 x y + x²) - (- 2 x y² + x² y - x² ) =
= - 5 x y² - x y + 8 x² + 2 x² y
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t ( x , y ) = 2*(3 x²y -2 xy + x²) - [ ( -7xy²+xy + 6x²) + (-2xy²+ x²y - x² ) ] =
= 6 x²y - 4 xy+2 x² - [ - 9 xy² + xy + 5 x² + x²y ] =
= 5 x²y - 5 xy - 3 x² + 9 xy²
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Odpowiedź:
s ( x , y ) = (- 7 x y² + x y + 6 x² ) + ( 3 x² y -2 x y + x²) - (- 2 x y² + x² y - x² ) =
= - 5 x y² - x y + 8 x² + 2 x² y
------------------------------------------------------------
t ( x , y ) = 2*(3 x²y -2 xy + x²) - [ ( -7xy²+xy + 6x²) + (-2xy²+ x²y - x² ) ] =
= 6 x²y - 4 xy+2 x² - [ - 9 xy² + xy + 5 x² + x²y ] =
= 5 x²y - 5 xy - 3 x² + 9 xy²
------------------------------------------------
Szczegółowe wyjaśnienie: