Question

determinati numerele naturale x x+3=5 2×x=42 2×x+4=12 4×x-3=17 X-7=9 X×7=35

Answer 1

x+3=5, x=5-3, x=2
2*x=42, x=42:2, x=21
2*x+4=12, 2x=12-4, 2x=8, x=8:2, x=4
4*x=17+3, 4x=20, x=20:4, x=5
x=9+7, x=16
x=35:7, x=5

Answer 2

x + 3 = 5 => x = 5 - 3 => x = 2 2 • x = 42 => x = 42 : 2 => x = 21 2 • x + 4 = 12 => 2 • x = 12 - 4 => 2 • x = 8 => x = 8 : 2 => x = 4 4 • x - 3 = 17 => 4 • x = 17 + 3 => 4 • x = 20 => x = 20 : 4 => x = 5 x - 7 = 9 => x = 9 + 7 => x = 16 x • 7 = 35 => x = 35 : 7 => x = 5