Question

Salut
cn ma poate ajuta?
(ofer coroana,5 stele)

Answer 1

$\bf \dfrac{2}{5} -\dfrac{1}{3}=\dfrac{2\cdot 3}{5\cdot3}-\dfrac{1\cdot5}{3\cdot5}=\dfrac{6-5}{15}=\dfrac{1}{15}$

$\bf (-2)^{2} \cdot 2^{6} :(-4)^{4} +2^{-1} =$

$\bf 2^{2} \cdot 2^{6} :4^{4} +\dfrac{1}{2}=$

$\bf 2^{2+6} :(2^{2})^{4} +\dfrac{1}{2}=$

$\bf 2^{8} :2^{8} +\dfrac{1}{2}=$

$\bf 1 +\dfrac{1}{2}=$

$\bf \dfrac{2+1}{2}=$

$\boxed{\bf \dfrac{3}{2}}$

$\bf \dfrac{4}{5} +x = 1$

$\bf x = 1-\dfrac{4}{5}$

$\bf x = \dfrac{5-4}{5}$

$\boxed{\bf x = \dfrac{1}{5}}$