Question

A 5phần7 - 11phần14.                       B 15 phần 7 : -18phần14 giúp hai câu ạ

Answer 1

\(a,\dfrac{5}{7}-\dfrac{11}{4}\)

\(=\dfrac{20}{28}-\dfrac{77}{28}\)

\(=\dfrac{20-77}{28}\)

\(=-\dfrac{57}{28}\)

\(b,\dfrac{15}{7}:-\dfrac{18}{14}\)

\(=\dfrac{15}{7}\times\left(-\dfrac{14}{18}\right)\)

\(=\dfrac{15\times\left(-14\right)}{7\times18}=-\dfrac{210}{126}=-\dfrac{5}{3}\)