Question

(1+ 1/2 + 1/3 + 1/4 - 1/2 :0.5) × 12/13 = 1

Answer 1

Răspuns:

(1+½+⅓+¼-½:½)×12/13=1

(1+½+⅓+¼-½:½)×12/13=1

(1+½+⅓+¼-1)×12/13=1 (1 se reduce cu -1)

(½+⅓+¼)×12/13=1 (aducem la acelasi numitor, 12)

(6/12+4/12+3/12)×12/13=1

13/12×12/13=1 (simplificăm 12 cu 12, 13 cu 13)

1=1

Answer 2

(1+1/2+1/3+1/4-1/2:0,5)×12/13=

=(1+1/2+1/3+1/4-1/2:1/2)×12/13=

=(1+1/2+1/3+1/4-1/2×2)×12/13=

=(1+1/2+1/3+1/4-1)×12/13=

=(1/2+1/3+1/4)×12/13=

=(6/12+4/12+3/12)×12/13=

=(10/12+3/12)×12/13=

=13/12×12/13=1