Exercițiul 1.............
![Exercițiul 1 class=](https://ro-static.z-dn.net/files/d59/4135ce2e358dc9e355fa4eab0b1b3eee.png)
a)-54a
b)+24x
c)-12a
d)+18ax
e)+60xy
f)+24xy la a 2 a
g)+21x la a 5 a
h)+8ab la a 3 a
i)-2x la a doua y la a 3 a z la a 2 a