a)
[tex](3 + x) \times 9y = 27y + 9xy[/tex]
b)
[tex]3x \times 9y = 27xy[/tex]
c)
[tex]9x \times 3y = 27xy[/tex]
d)
[tex](3 + 3x) \times 3y = 9y + 9xy[/tex]
Odpowiedź: A (II i III)
