August 2018 1 16 Report
Sprawdź i popraw błędy .

a) ( 2x+y ) ( x-2y ) - x ( x+ y ) = 2x² - 4xy + xy - 2y² - x² + xy = x² - 2xy - 2y²

b) (3a- 2b ) ( a-b ) + 2 ( a - b ) ( a- 2b ) = 3a² - 3 ab - 2ab + 2b² + 2 ( a² - 2ab - ab - 2b² ) = 5a² - 10 ab + 6b²

c) ( 4k + 1 ) ( 2k - 1 ) - (k - 1 ) (k-3 ) = 8k² - 4k + 2k - 1 - ( k² + 3k - k + 3 ) = 7k² - 4k - 4
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