Question

Giúp mình với ạ, giải chi tiết nhé !

Mình xin cảm ơn !

a/ \(\sqrt{25}\) - 3\(\sqrt{\dfrac{4}{9}}\)

b/ (2 - \(\dfrac{5}{3}\)) : (\(\dfrac{2}{7}\) + \(\dfrac{5}{21}\) - 1)

c/ 12,7 - 17,2 + 199,9 - 22,8 - 149,9

d/ (\(\dfrac{-1}{2}\))⁴ + |\(\dfrac{-2}{3}\)| - 2007⁰

e/ 4(\(\dfrac{-1}{2}\))³ + |\(\dfrac{1}{2}\)| : 5

g/ 3 - (\(\dfrac{-6}{7}\))⁰ + \(\sqrt{9}\) : 2

h/ \(\dfrac{27}{23}\) + \(\dfrac{5}{21}\) - \(\dfrac{4}{23}\) + \(\dfrac{6}{21}\) + \(\dfrac{1}{2}\)

 

Answer 1

a, \(\sqrt{25}-3\sqrt{\dfrac{4}{9}}=5-3.\dfrac{2}{3}=3\)

Answer 2

b, \(\left(2-\dfrac{5}{3}\right):\left(\dfrac{2}{7}+\dfrac{5}{21}-1\right)\)

\(=\dfrac{1}{3}:\dfrac{6+5-21}{21}\)

\(=-\dfrac{1}{3}.\dfrac{21}{10}\)

\(=-\dfrac{7}{10}\)