a) [0,(25) - 0,25] : 0,(02) =
= (25/99 - 25/100) : 2/99
= (⁴⁾25/99 - ⁹⁹⁾1/4) x 99/2
= (100 - 99)/4ₓ99 x 99/2
= 1/4ₓ99 x 99/2
= 1/8
b) [0,(32) - 0,32] : 618,75 =
= (32/99 - 32/100) : 61875/100
= (²⁵⁾32/99 - ⁹⁹⁾8/25) x 4/2475
= (800 - 792)/2475 x 4/2475
= 8/2475 x 4/2475
= 32/2475²
