Răspuns :
15 x (0,5 - 1/6 + 0.6) =
= 15 x (1/2 - 1/6 + 3/5)
= 15 x (15 - 5 + 9)/30
= 15 x 18/30
= 18/2
= 9
15• ( 5/10 - 1/6 + 6/10)
15• ( 15 - 5+ 18/30)
15• 28/30
420/30 care se simplifica prin 30 = 14/1
=14
15• ( 15 - 5+ 18/30)
15• 28/30
420/30 care se simplifica prin 30 = 14/1
=14