a) 3/4 × 4/5 + 1/5 = 3/5 + 1/5 = 4/5
b) 3/4 + 4/5 × 5/8 = 3/4 + 1/2 = 3/4 + 2/4 = 5/4 = 1 intreg si 1/4 =1,25
c) ( 5/6 + 19 /24) × 24 / 13 = ( 20/24 + 19 / 24) × 24/13 = 39 / 24 × 24 / 13 = 3
d) 18/13 × ( 10/9 + 1/3) = 18/13 × 13/9 = 2
e) 12/35 × ( 6/5 - 1/4 ) =12/35 × ( 24/20 - 5/20 ) = 12/35 × 19/20 =
= ( 3×19) / ( 35 × 5) = 57/175
f) 21/8 × ( 9/15 - 5/15 ) + 4 /15 = 21/18 × 4/15 + 4/15 = 7/( 2×5) + 4/15 =
= 7/10 + 4/15 = 21/30 + 8/30 = 29/30
