Question

Giúp tui típ đê mè :/

 

Answer 1

chịu

 

Answer 2

quy đồng mẫu từng cái rồi tính

Answer 3

quy đồng đi pa

Answer 4

6)

\(=\dfrac{3}{11}+\dfrac{8}{11}+-\dfrac{5}{7}\) 

\(=\left(\dfrac{3}{11}+\dfrac{8}{11}\right)+-\dfrac{5}{7}\)

\(=1+\dfrac{-5}{7}\)

\(=\dfrac{7}{7}+-\dfrac{5}{7}\)

\(=\dfrac{2}{7}\)

7)

\(=\dfrac{10}{20}+\dfrac{15}{20}-\left(\dfrac{15}{20}-\dfrac{16}{20}\right)\)

\(=\dfrac{25}{20}-\left(-\dfrac{1}{20}\right)\)

\(=\dfrac{13}{10}\)

8)

\(=\left(\dfrac{9}{24}+-\dfrac{18}{24}+\dfrac{14}{24}\right):\dfrac{5}{6}+\dfrac{1}{2}\)

\(=\dfrac{5}{24}:\dfrac{5}{6}+\dfrac{1}{2}\)

\(=\dfrac{5}{24}.\dfrac{6}{5}+\dfrac{1}{2}\)

\(=\dfrac{1}{4}+\dfrac{1}{2}\)

\(=\dfrac{1}{4}+\dfrac{2}{4}\)

\(=\dfrac{3}{4}\)