Question

4 si 5, dau coroana, urgent!!!

Answer 1

Salut, Robert!

Răspuns:

Explicație pas cu pas:

4.

20² = 400;  16² = 256;  12² = 144,  9² = 81

A = (400-256)/9 + (144+81)/25

A = 144/9 + 225/25

A = 16 + 9

A = 25

√A = √(25) = 5 ∈ N

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5.

B = √(16/9) + √(25/9) - √36 + √64

B = 4/3 + 5/3 - 6 + 8

B = 9/3 + 2

B = 3 + 2

B = 5 → număr natural