Odpowiedzi

2009-10-21T21:48:09+02:00
2
a) 7(5a - b) - 3(2a - 3b) =35a-7b-6a-9b=29a-16b
b) 4x(y -3) + 5y(3-10x) + (2x +5)(6-3y) =4xy-12+15y-50yx+12x-15y=4xy-12-50yx+12x