Question

Arătați că (1+1/2+1/3+1/4-1/2:0,5)•12/13=1​

Answer 1

Răspuns:

(1+1/2+1/3+1/4-1/2:0,5)•12/13=1​

(1+1/2+1/3+1/4-1/2:5/10)×12/13=1

(1+1/2+1/3+1/4-1/2×10/5)•12/13=1​

(1+1/2+1/3+1/4-1/2×2)•12/13=1​

(1+1/2+1/3+1/4-1)•12/13=1​

(6/12+4/12+3/12)×12/13=1

13/12×12/13=1

1=1

Adevarat

Explicație pas cu pas: