Minh An
Giới thiệu về bản thân
a)x-\(\dfrac{2}{3}\)=\(\dfrac{-5}{12}\)
x =\(\dfrac{-5}{12}\)+\(\dfrac{2}{3}\)
x =\(\dfrac{-5}{12}\)+\(\dfrac{8}{12}\)
x =\(\dfrac{3}{12}\)=\(\dfrac{1}{4}\)
b)\(\dfrac{8}{5}\):x=\(\dfrac{-2}{3}\)
x=\(\dfrac{8}{5}\):\(\dfrac{-2}{3}\)
x=\(\dfrac{8}{5}\).\(\dfrac{-3}{2}\)
x=\(\dfrac{-24}{10}\)
c)1-\(\dfrac{3}{7}\).x=-\(\dfrac{2}{7}\)
a)(\(\dfrac{-2}{7}\) +\(\dfrac{2}{7}\)):\(\dfrac{3}{5}\)=\(\dfrac{0}{7}\):\(\dfrac{3}{5}\)=0:\(\dfrac{3}{5}\)=0
b)(\(\dfrac{-8}{19}\)+\(\dfrac{27}{19}\))-(\(\dfrac{-4}{21}\)+\(\dfrac{17}{21}\))=\(\dfrac{19}{19}\)-\(\dfrac{13}{21}\)=\(\dfrac{21}{21}\)-\(\dfrac{13}{21}\)=\(\dfrac{8}{21}\)
c)\(\dfrac{6}{5}\).(\(\dfrac{3}{13}\)-\(\dfrac{16}{13}\))=\(\dfrac{6}{5}\).\(\dfrac{-13}{13}\)=\(\dfrac{6}{5}\).(-1)=\(\dfrac{-6}{5}\)
4/3 ; 1/3 ; 4/7 ; 20/3