Va rog ajutați-mă !!

[tex]\it b)\ \ 5\dfrac{1}{2}-2,5=5,5-2,5=3\\ \\ c)\ \ 1,2-1\dfrac{4}{5}=1,2-1,8=-0,6\\ \\ e)\ \ 0,(7)-2\dfrac{1}{9}=\dfrac{7}{9}-\dfrac{19}{9}=-\dfrac{\ 12^{(3}}{9}=-\dfrac{4}{3}[/tex]