Question

VA ROG REPEDE DAU 100 PUNCTE SI COROANA!!!

Answer 1

1/2 - 5/11 + 7/2 - 9/11 =

= (1/2 + 7/2) - (5/11 + 9/11)

= 8/2 - 14/11

= ¹¹⁾4 - 14/11

= (44 - 14)/11

= 30/11

= 2  8/11

Answer 2

$\it \dfrac{1}{2}-\dfrac{5}{11}+\dfrac{7}{2}-\dfrac{9}{11}=(\dfrac{1}{2}+\dfrac{7}{2})-(\dfrac{5}{11}+\dfrac{9}{11}) =\dfrac{8}{2}-\dfrac{14}{11}=4-1\dfrac{3}{11}=\\ \\ \\ =3\dfrac{11}{11}-1\dfrac{3}{11}=2\dfrac{8}{11}$