Odpowiedź:
Zadanie 4
A)3,2+5,64= 8,84
6,47- 4,3= 2,17
4/13 +7/13= 11/13
9/13-5/13= 4/13
B)5,43+12,7= 18,13
18,25-7,17= 11,08
3 i 5/7 +4/7= 3 9/7 = 4 2/7
5 i 6/7-3/7= 5 3/7
Zadanie 5
A)
2i 3/20+1/4= 2 3/20 + 5/20 = 2 8/20 = 2 2/5
1i 5/18+2całe 4/9+5/6= 1 5/18 + 2 8/18 + 15/18 = 3 13/18 + 15/18 = 3 28/18 =
=4 10/18 = 4 5/9
3i 1/2+2całe 3/4+1cała 1/3= 3 2/4 + 2 3/4 + 1 1/3 = 5 5/4 + 1 1/3 = 6 1/4 + 1 1/3
= 6 3/12 + 1 4/12 = 7 7/12
3i 1/20 - 3/4= 2 21/20 - 15/20 = 2 6/20 = 2 3/10
1 i 7/18-2całe 2/9= 1 7/18 - 1 11/9 = 1 7/18 - 1 22/18 = -15/18 = -5/6
2 i 1/7-5całych 2/3= 2 3/21 - 5 14/21 = -3 11/21
Szczegółowe wyjaśnienie:
