Question

Oblicz ; a) 1 1/3+3 2/3 b) 4 2/3+7 4/5 c) 4 1/3-2 2/3 d) 6 3/5-8 4/5 e) -3 2/7+7 6/7 f) -9 4/9-5 7/9 g) 1 1/2 +1/3 h)2 2/3 +1/2 i)3 1/2-1/4 j)1 1/4-1/2 k)2 3/4-3 1/2 l)5 1/4- 4 2/3

Answer 1

a)  1 1/3+3 2/3 = 4 3/3 = 5

b)  4 2/3+7 4/5 = 4 10/15 + 7 12/15 = 11 22/15 = 12 7/15

c)  4 1/3-2 2/3 =  3 4/3 - 2 2/3 = 1 2/3

d) 6 3/5-8 4/5 =5 8/5 - 8 4/5 = -3 4/5

e) -3 2/7+7 6/7 = -2 9/7 + 7 6/7 =5 3/7 

f) -9 4/9-5 7/9 =-12 11/9 = 13 3/9

g) 1 1/2 +1/3 = 1 3/6 + 2/6 = 1 5/6

h)2 2/3 +1/2 = 2 4/6 + 3/6 = 2 7/6= 3 1/6

i)3 1/2-1/4 = 3 2/4 - 1/4 3 1/4

j)1 1/4-1/2 = 1 1/4 - 2/4 = 5/4 -2/4 = 3/4

k)2 3/4-3 1/2 = 2 3/4 - 3 2/4 1 1/4

l)5 1/4- 4 2/3 = 5 3/12 - 4 8/12= 4 15/12 - 4 8/12 = 7/12