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daca x plus y = 4 si y plus z = 12 calculati 3x plus 5y plus 2z

Răspuns :

Bună!

x+y=4

y+z=12

3x+5y+2z=?

x+y=4/×3

y+z=12/×2

3x+3y=12

2y+2z=24

3x+5y+2z=12+24=36