Odpowiedź:
1.
3 i 1/4 + 2 i 2/5 - (4 i 1/3 - 2 i 2/3) =
= 3 i 5/20 + 2 i 8/20 - (3 i 4/3 - 2 i 2/3) =
= 5 i 13/20 - 1 i 2/3 =
= 5 i 3/60 - 1 i 40/60 =
= 4 i 63/60 - 1 i 40/60 =
= 3 i 23/60
2.
[2⁻¹ + (1/3)⁻¹ ] ⁻ ² =
= [ 1/2 + 3] ⁻² =
= [ 3 i 1/2] ⁻² =
= [7/2]⁻²=
= [2/7]² =
= 4/49
3.
(4 i 1/3 - 2 i 2/5) - (6 i 3/5 - 2 i 2/3) =
= (4 i 5/15 - 2 i 6/15) - (6 i 9/15 - 2 i 10/15)=
= (3 i 20/15 - 2 i 6/15) - (5 i 24/15 - 2 i 10/15) =
= 1 i 14/15 - 3 i 14/15 =
= - 2
Szczegółowe wyjaśnienie:
