Răspuns :
2/3*1/7+2/3*5/14=
=2/21+1/3*5/7=
=2/21+5/21=
=1/3
2/3*1/7+2/3*5/14=
=2/21+10/42=
=14/42=
=2/6=
=1/3
=2/21+1/3*5/7=
=2/21+5/21=
=1/3
2/3*1/7+2/3*5/14=
=2/21+10/42=
=14/42=
=2/6=
=1/3