Bài 74 trang 39 SGK Toán 6 tập 2

\(a\)

\(\dfrac{{ - 2}}{3}\)

\(\dfrac{4}{{15}}\)

\(\dfrac{9}{4}\)

\(\dfrac{5}{8}\)

\(\dfrac{4}{5}\)

\(\dfrac{4}{{15}}\)

\(0\)

\(\dfrac{{13}}{{19}}\)

\(\dfrac{{ - 5}}{{11}}\)

\(0\)

\(b\)

\(\dfrac{4}{5}\)

\(\dfrac{5}{8}\)

\(\dfrac{{ - 2}}{3}\)

\(\dfrac{4}{{15}}\)

\(\dfrac{{ - 2}}{3}\)

 \(1\) 

\(\dfrac{{ - 6}}{{13}}\)

\(1\)

\(0\)

\(\dfrac{{ - 19}}{{43}}\)

\(a.b\)

\(\dfrac{{ - 8}}{{15}}\)

\(\dfrac{1}{6}\)

\(\dfrac{{ - 3}}{2}\)

\[\dfrac{1}{6}\]

\(\dfrac{{ - 8}}{{15}}\)

\(\dfrac{4}{{15}}\)

\(0\)

\(\dfrac{{13}}{{19}}\)

\(0\)

\(0\)