Question

alguém sabe como resolve​

Answer 1

Resposta:

Vamos lá!

• Simplifique as operações sempre que necessário.

$(-\dfrac{2}{3} )^{2} +\dfrac{\dfrac{2}{7} }{\dfrac{-4}{7} } -3(\dfrac{7}{5} )+\dfrac{5}{4} =\\\\\\(\dfrac{4}{9} )+{\dfrac{14}{-28}} -\dfrac{21}{5} +\dfrac{5}{4} =\\\\\\\dfrac{4}{9} +{\dfrac{14^{:14} }{-28}} -\dfrac{21}{5} +\dfrac{5}{4} =\\\\\\\dfrac{4}{9} +{\dfrac{1}{-2}} -\dfrac{21}{5} +\dfrac{5}{4} =\\\\mmc=180\\\\\dfrac{20.4+(-90)-(36.21)+45.5}{180} =\\\\\\\dfrac{80-90-756+225}{180}=\\\\\\\dfrac{305-846}{180}=\\\\\\-\dfrac{541}{180}$