Question

Calculeza B-A unde. A=1+3+5......+25 si B=2+6+10+......+50​

Answer 1

B = 2 + 6 + 10 + ... +50 = 2(1 + 3 + 5 + ... + 25) = 2A

B - A = 2A - A = A

A = 1 + 3 + 5 + ... + 25 = 13² = 169

Answer 2

Răspuns:

169

Explicație pas cu pas:

B=2(1+3+5+...+25)

A=1+3+5+...+25

B-A=2(1+3+5+...+25)-(1+3+5+...+25)=1+3+5+...+25=6×26+13=156+13=169