Zamień sumę na iloczyn.
a) x(2a-3b)+2x(2a-3b)
b) 2a(4x-y)-(y+4x)a
c) 3x(3a-2b)+5x(3a-2b)
(Zad.8 str. 203 -,,Matematyka wokół nas" [klasa 3 gimnazjum])
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a). x(2a-3b)+2x(2a-3b) =
= 2ax - 3bx + 4ax - 6bx =
= 6ax - 9bx =
3x(2a - 3b)
b). 2a(4x-y)-(y+4x)a =
= 8ax - 2ay - ay - 4ax =
= 4ax - 3ay =
= a(4x - 3y)
c). 3x(3a-2b)+5x(3a-2b) =
= 9ax - 6bx + 15ax - 10 bx =
= 24ax - 16bx =
= 8x (3a - 2b)