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* a+b=17
c=19
______
a×c+b×c=



* x+y=10
z=144
_______
x×z+y×z=?​


Răspuns :

Salut!:)

a) a + b = 17

c = 19

________

a × c + b × c = ?

a × c + b × c = c ( a + b )

Inlocuim:

19 × 17 = 323

b)x + y = 10

z = 144

_________

x × z + y × z = ?

x × z + y × z = z ( x + y )

Inlocuim:

144 × 10 = 1440

Bafta!:)