Question

care este rezultatul calculului 2 pe 5 + 4 pe 9 : 10 pe 9

Answer 1

2/5  +  4/9 * 9/10 =
2/5 +2/5=
4/5
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Answer 2

$\it \dfrac{2}{5}+\dfrac{4}{9}:\dfrac{10}{9} = \dfrac{2}{5}+\dfrac{4}{9}\cdot\dfrac{9}{10} = \dfrac{2}{5}+\dfrac{2}{5}=\dfrac{2+2}{5}=\dfrac{^{2)}4}{\ 5} =\dfrac{8}{10} =0,8$