Question

Dodawanie i odejmowanie liczb dodatnich.
Oblicz (zapisz wynik w postaci ulamka wlasciwego lub liczby mieszanej):
a) 2/3 +1/4 = ?/12 + ?/12 =
b) 5/9 + 3/5 =
c) 2/3 + 4/5 =
d) 5/8 + 3/7 =
e) 1 1/2 + 2 3/8 = 1 ?/8 + 2 3/8 =
f) 2/9 + 1 7/27 =
g) 1 5/6+ 3 1/9 =
h) 2 1/10 + 1 7/15 =

Answer 1

A) 2/3 + 1/4 = 8/12 + 3/12 = 11/12
b) 5/9 + 3/5 = 25/45 + 27/45 = 52/45 = 1 7/45 
c) 2/3 + 4/5 = 10/15 + 12/15 = 22/15 = 1 7/15 
d) 5/8 + 3/7 = 35/56 + 24/56 = 59/56 = 1 3/56 
e) 1 1/2 + 2 3/8 = 1 4/8 + 2 3/8 = 3 7/8
f) 2/9 + 1 7/27 = 6/27 + 1 7/27 = 1 13/27
g) 1 5/6 + 3 1/9 = 1 15/18 + 3 2/18 = 4 17/18
h) 2 1/10 + 1 7/15 = 2 3/30 + 1 14/30 = 3 17/30