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Calculează (5xa) +(3xb )+(3xc) +(5xd),știind ca a+b+c+d=20 si ca b+c=9.
Rezolvați rapid va rog ,e urgent !


Răspuns :

5a+3b+3c+5d =
5a+5d + 3b+3c =
5(a+d) + 3(b+c) =
5(a+d) + 3*9 =
5(a+d) + 27

a+b+c+d = 20
b+c = 9
a+b+c+d - (b+c) = 20-9
a+d = 11

5(a+d) + 27 = 5*11 + 27 = 55+27 = 82
Salut,

5a+3b+3c+5d = ?

a+b+c+d = 20
b+c = 9.

a+b+c+d = 20
a+9+d = 20
a+d = 20-9
a+d = 11.

5a+5d+3b+3c =
5(a+d)+3(b+c) =
5•11+3•9 = 55+27 = 82.


Succes! :3