Question

\(\dfrac{8}{9}\)+\(\dfrac{1}{9}\):\(\dfrac{6}{7}\)-\(\dfrac{7}{10}\)=

Answer 1

\(\dfrac{8}{9}\)+ \(\dfrac{1}{9}\):\(\dfrac{6}{7}\)- \(\dfrac{7}{10}\)= \(\dfrac{8}{9}\)+\(\dfrac{7}{54}\)-\(\dfrac{7}{10}\)

= \(\dfrac{43}{135}\)

Answer 2

Ta có: \(\dfrac{8}{9}+\dfrac{1}{9}:\dfrac{6}{7}-\dfrac{7}{10}\)

\(=\dfrac{8}{9}+\dfrac{7}{54}-\dfrac{7}{10}\)

\(=\dfrac{240}{270}+\dfrac{35}{270}-\dfrac{189}{270}\)

\(=\dfrac{240}{270}+\dfrac{35}{270}+\dfrac{-189}{270}\)

\(=\dfrac{240+35+\left(-189\right)}{270}\)

\(=\dfrac{38}{135}.\)

CHÚC BN HỌC GIỎI!!!^ - ^