Răspuns :

Răspuns:

a = 20 × [441 : 21² + 2 × (2⁶⁰ × 3²⁰ ) ÷ (2⁵⁹ × 3²⁰)]

a = 20 × [21² : 21² + 2 × (2⁶⁰⁻⁵⁹ × 3²⁰⁻²⁰)]

a = 20 × [21²⁻² + 2 × (2¹ × 3⁰)]

a = 20 × (21⁰ + 2 × 2 × 1)

a = 20 × (1 + 4)

a = 20 × 5

a = 100

a = 10² → patrat perfect

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