1/2 + 1/3 : 2/6 =
= 1/2 + 1/3 : 1/3 =
= 1/2 + 1 =
= (1+2)/2 =
= 3/2
1/2 :2/3 + 3/4 : ( - 5/6 ) =
= 1/2 × 3/2 - 3/4 × 6/5 =
= 3/4 - 18/20 =
= 3×5/20 - 18/20 =
= 15/20 - 18/20 =
= - 3/20
(-5/8) : (-10/4) + 1/2 =
= - 5/8 × ( - 4/10) + 1/2 =
= 20/80 + 1/2 =
= 1/4 + 1/2 =
= 1/4 + 2/4 =
= 3/4
