October 2018 1 47 Report

w wykropkowane miejsca wstaw odpowiednie wyrażenia :

a) (4a -.......) (5a + 2b ) = 20a ^{2} -7ab - ..........

b) (2y - 3x ) ( ...... - 5y ) = 23xy - .........- 12x ^{2}

c) ( .....+5mn ) (2m - 3 ) = -3mn - .......+10m ^{2} n


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