Question

1)Dacă x + y = 11 iar z = 8,aflați 2x + 2y + z
2)Dacă a+b=7 iar b + c=10 aflați a+3b+2c

Dau coroniță

Answer 1

1) 2x+2y+z=2(x+y)+z=2x11+8=22+8=30

2) a+b=7
b+c=10 I x2=>2b+2c=20
a+b+2b+2c=7+20=>a+3b+2c=27