Question

Stiind ca 1×2×3×a×5=5×2×3×1,afla numarul necunoscut?

Answer 1

se fac inmultirile si rezulta

30a=30

a=30/3

a=10

Answer 2

( 1 × 2 × 3 ) × a = 10 × 3 × 1
( 2 × 3 × 5 ) × a = 10 × 3
( 6 ×5) × a = 30
30 × a = 30
a = 30 : 30
a = 1