a) - 8 / 21 : 4 / 7 = - 8 / 21 × 7 / 4 = - 2 / 3
b) 2 / 3 : ( - 7 / 5 ) = 2 / 3 × ( - 5 / 7 ) = - 10 / 21
c) ( - 12 / 7 ) : ( - 3 / 4 ) = + 12 / 7 × 4 / 3 = 16 / 7 = 2 intregi si 2 / 7
d) 7 / 15 : ( - 14 ) = 7 / 15 × ( - 1 / 14 ) = - 1 / 30
e) 1 : ( - 2 / 5 ) = 1 × ( - 5 / 2 ) = - 5 / 2 = - 2 intregi si 1 / 2 = - 2,5
f) 2 intregi si 1 / 4 = ( 2 x 4 + 1 ) / 4 = 9 / 4
3 intregi si 1 / 5 = ( 3 x 5 + 1 ) / 5 = 16 / 5
= ( - 9 / 4 ) : ( - 16 / 5 ) = ( - 9 / 4 ) × ( - 5 / 16 ) = 45 / 64