4 . Aflați fracțiile ce lipsesc
e urgent dau orice

1/4 + x = 1
x = 1- 1/4
x = 4/4 - 1/4 = 3/4
1 - x = 1/6
x = 1 - 1/6
x = 6/6 - 1/6 = 5/6
1 - x = 2/3
x = 1 - 2/3
x = 3/3 - 2/3 = 1/3