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D Daca x + y = 12 si y + z = 35,
calculati a) x + 2 y + Z​


Răspuns :

a)

x+y=12

y+z=35

=> x+2y+z=12+35=47

b)

x+y=12/×4 => 5x+5y=60

y+z=35/×4 => 4z+4y=140

=> 5x+5y+4z+4y=60+140

5x+9y+4z=200

x + y + y + z = 35 + 12 = 47 inseamna ca x+ 2y + z = 47

Sper ca te-am ajutat! Coroana??