a) 3/7 *2intreg 4/9 + 2/3 *3/7 = 3/7* 22/9 +2/3 *3/7=
la primul termen simplific prin 3 si la a doilea tot prin 3
=22/21 +2/7
aducem la acelasi numitor
=22/21 +6/21=28/21simplific cu 7=4/3
b) 2 intreg 2/3 *1 intreg 4/11- 1 intreg 4/11 *1intreg 1/5=
=8/3 *15/11- 15/11 *6/5=
la primul termen simplific cu 5 si la al doilea tot cu 5
=40/11- 18/11=22/11=2
