Question

Thực hiện phép tính

a. 3/5 : ( -1/15 - 1/6 ) + 3/5 : ( -1/3 -16/15)

Answer 1

\(\frac{3}{5}:\left(-\frac{1}{15}-\frac{1}{6}\right)+\frac{3}{5}:\left(-\frac{1}{3}-\frac{16}{15}\right)\)

\(=\frac{3}{5}:\left(-\frac{7}{30}\right)+\frac{3}{5}:\left(-\frac{7}{5}\right)\)

\(=\frac{3}{5}.\left(-\frac{30}{7}\right)+\frac{3}{5}.\left(-\frac{5}{7}\right)\)

\(=\frac{3}{5}\left(-\frac{30}{7}-\frac{5}{7}\right)\)

\(=\frac{3}{5}.\left(-\frac{35}{7}\right)\)

\(=-3\)