Question

Thực hiện phép tính

a, \(\frac{2}{3}+\frac{1}{3}.\left(\frac{-4}{9}+\frac{5}{6}\right):\frac{7}{12}\)

b, \(\frac{5}{9}.\frac{8}{11}+\frac{5}{9}.\frac{9}{11}-\frac{5}{9}.\frac{6}{11}\)

Answer 1

a. \(\frac{2}{3}+\frac{1}{3}.\left(\frac{-4}{9}+\frac{5}{6}\right):\frac{7}{12}\)

\(=1.\frac{7}{12}:\frac{7}{12}\)

\(=1\)

b. 

\(\frac{5}{9}.\frac{8}{11}+\frac{5}{9}.\frac{9}{11}-\frac{5}{9}.\frac{6}{11}\)

\(=\frac{5}{9}.\left(\frac{8}{11}+\frac{9}{11}-\frac{6}{11}\right)\)

\(=\frac{5}{9}.1\)

\(=\frac{5}{9}\)

Tk mk nha!

Answer 2

b)  \(=\frac{5}{9}.\left(\frac{8}{11}+\frac{9}{11}-\frac{6}{11}\right)\)

\(=\frac{5}{9}.1\)

\(=\frac{5}{9}\)

Answer 3

a,\(=\frac{2}{3}+\left(\frac{-4}{27}+\frac{5}{18}\right):\frac{7}{12}\)=\(\frac{2}{3}+\frac{-16}{63}+\frac{10}{21}\)=\(\frac{8}{9}\)

Answer 4

b,\(\frac{5}{9}.\left(\frac{8}{11}+\frac{9}{11}+\frac{6}{11}\right)\)=\(\frac{5}{9}+\frac{23}{11}\)=\(\frac{262}{99}\)