Question

Oblicz:
1. 2 1/5 +7/10+1 2/5=
2. 2 7/12+1 1/15+1/2=
3. 7/8-1/4-1/2=
4. 3 11/12-5/9-1 3/4=
5. 2 5/6-7/8-1 1/4=
Te przykłady mają być rozpisane.

Answer 1

1.
2 1/5 +7/10+1 2/5=
= 2 2/10 + 7/10 + 1 4/10 =
= 2 9/10 + 1 4/10 = 3 13/10 = 4 3/10
2.
2 7/12+1 1/15+1/2=
= 2 35/60 + 1 4/60 + 30/60 =
= 3 39/60 + 30/60 = 3 69/60 = 4 9/60 = 4 3/20
3.
7/8-1/4-1/2=
= 7/8 - 2/8 - 4/8 = 9/8 - 4/8 = 5/8
4.
3 11/12-5/9-1 3/4=
= 3 33/36 -  20/36 - 1 27/36 =
= 3 13/36 - 1 27/36 = 2 49/36 - 1 27/36 = 
= 1 22/36 = 1 11/18
5.
2 5/6-7/8-1 1/4=
= 2 20/24 - 21/24 - 1 6/24 =
= 1 44/24 - 1 27/24 = 17/24