Question

Arătați că :
a) 1/1×2=1-1/2
b) 1/2×3=1/2-1/3
c) 2/5×7= 1/5-1/7
Va rog foarte mult sa ma ajutati ca imi trebuie urgent !

Answer 1

1/(1 x 2) = 1/2 ; 1-1/2 = 2/2-1/2 = 1/2 => 1/(1x2) = 1-1/2

1/(2x3) = 1/6 ; ³⁾1/2-²⁾1/3 = (3-2)/(2x3) = 1/6 => 1/(2x3) = 1/2-1/3

2/(5x7) = 2/35 ; ⁷⁾1/5-⁵⁾1/7 = (7-5)/(5x7) = 2/35 => 2/(5x7) = 1/5-1/7