Thực hiện phép tính: -5/7 .3/11+ -5/7.8/11+5/7

* Hướng dẫn giải

$\begin{array}{l}a)\frac{-5}{7}.\frac{3}{11}+\frac{-5}{7}.\frac{8}{11}+\frac{5}{7}\\ \\ =\frac{-5}{7}.\left(\frac{3}{11}+\frac{8}{11}-1\right)=0\end{array}$

$\begin{array}{l}b)\frac{5}{7}.\frac{10}{11}+\frac{5}{7}.\frac{14}{11}-\frac{5}{7}.\frac{17}{11}\\ \\ =\frac{5}{7}.\left(\frac{10}{11}+\frac{14}{11}-\frac{17}{11}\right)=\frac{5}{11}\end{array}$

$c\left)\frac{-52}{57}\begin{array}{cccc}& & & \end{array}d\right)\frac{4}{3}$