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GimnazjumMatematyka 5+3 pkt
MODERUJ
Sprawdź i popraw błędy .
a) ( 2x+y ) ( x-2y ) - x ( x+ y ) = 2x² - 4xy + xy - 2y² - x² - xy = x² - 4xy - 2y²
b) (3a- 2b ) ( a-b ) + 2 ( a - b ) ( a- 2b ) = 3a² - 3 ab - 2ab + 2b² + 2 ( a² - 2ab - ab +2b² ) = 5a² - 11 ab + 6b²
c) ( 4k + 1 ) ( 2k - 1 ) - (k - 1 ) (k-3 ) = 8k² - 4k + 2k - 1 - ( k² - 3k - k + 3 ) = 7k² +2k - 4