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Sagot :

AYUDA

1) a (2b + c)+c (3a-2)=

= a*2b + a*c + c*3a + c*(-2)

=  2ab  + ac   + 3ac  - 2c

2ab + 4ac - 2c

2) 3 (y - 4)+5 (y+6) =

= 3*y + 3*(-4) + 5*y + 5*6

= 3y - 12 + 5y + 30

= 8y + 18

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