a) ( 3 intregi si 1 / 2 - 1 / 2) + ( 1 intreg si 1 / 3 - 1 / 3) = 3 intregi + 1 intreg = 4
sau introducem intregii in fractii
( 7 / 2 - 1 / 2) + ( 4 / 3 - 1 / 3 ) = 6 / 2 + 3 / 3 = 3 + 1 = 4
c)
3 : ( 11 / 4 - 43 / 28 ) + 2 / 3 : 3 / 2 =
= 3 : ( 77 / 28 - 43 / 28 ) + 2 / 3 × 2 / 3 =
= 3 × 34 / 28 + 4 / 9 =
= 3 × 17 / 14 + 4 / 9 =
= 9 × 51 / 126 + 56 / 126 =
= 459 / 126 + 56 / 126 =
= 515 / 126 = 4 intregi si 11 / 126
