Đặt thừa số chung 3/5:(-1.1/15-1/6)+3/5:(-1/3-1.1/a5)

* Hướng dẫn giải

$\begin{array}{l}\frac{3}{5}:\left(-1\frac{1}{15}-\frac{1}{6}\right)+\frac{3}{5}:\left(\frac{-1}{3}-1\frac{1}{15}\right)\\ =\frac{3}{5}:\left(\frac{-16}{15}-\frac{1}{6}\right)+\frac{3}{5}:\left(\frac{-1}{3}-\frac{16}{15}\right)\\ =\frac{3}{5}:\left(-\frac{37}{30}\right)+\frac{3}{5}:\frac{-7}{5}\\ =\frac{3}{5}.\frac{-30}{37}+\frac{3}{5}.\frac{-5}{7}=\frac{3}{5}.\left(\frac{-30}{37}+\frac{-5}{7}\right)\\ =\frac{3}{5}.\frac{-395}{259}\\ =\frac{-237}{259}\end{array}$