Explicație pas cu pas:
m (a) este media aritmetică
[tex]x + y = 26 + 82 = 108 \\ \frac{x + y}{2} = \frac{108}{2} = 54[/tex]
[tex]x + y = 321 + 525 = 846 \\ \frac{x + y}{2} = \frac{846}{2} = 423[/tex]
[tex]x = (x + y) - y = 50 - 18 = 32 \\ \frac{x + y}{2} = \frac{50}{2} = 25[/tex]
[tex]y = (x + y) - x = 72 - 21 = 51 \\ \frac{x + y}{2} = \frac{72}{2} = 36[/tex]
[tex]x + y = 2 \times m = 2 \times 8 = 16 \\ x = (x + y) - y = 16 - 5 = 11[/tex]
[tex]x + y = 2 \times m = 2 \times 50 = 100 \\ y = (x + y) - x = 100 - 30 = 70[/tex]
