a) (x+2)(y+3)
= xy + 3x + 2x + 6
b) (a+5)(7+b)
= 7a + ab + 35 + 5b
c) (4a+2)(1+5b)
= 4a + 20ab + 2 + 10b
d) (6y+1)(9+x)
= 54y + 6xy + 9 + x
voici les réponses :)
