Odpowiedź:
1 A
2 D
3 B
4 D
53/5= 1/x + 1/y
a) 5 i 2 1/5 + 1/2 = (2+5)/10 = 7/10
b) 6 i 4 1/6 + 1/4 = (2+3)/12 = 5/12
c) 10 i 2 1/10 + 1/2 = (1+5)/10 = 6/10 = 3/5 ( pasuje)
d) 10 i 6 1/10 + 1/6 = (3+5)/30 = 8/30 = 2/15
6 B
