Question

vă rog ajutați-mă trebuie sa scriu foarte repede ​

Answer 1

$\it 1) \ \ 2-2\cdot\Big(\dfrac{5}{2}-\dfrac{3}{4}\Big)=2-2\cdot\dfrac{1}{2}\cdot\Biog(5-\dfrac{3}{2}\Big)=2-\dfrac{7}{2}=-\dfrac{3}{2}=-1,5\\ \\ \\ 4) \ E=\dfrac{1}{2}+\dfrac{1}{2}-1=0$