\(\dfrac{7}{9}\) . \(\dfrac{5}{6}\) =\(\dfrac{35}{54}\)
\(\dfrac{1}{5}\) : \(\dfrac{7}{10}\) = \(\dfrac{10}{35}\)
\(\dfrac{6}{7}\) . (\(\dfrac{2}{3}\) \(-\)\(\dfrac{3}{5}\)) = \(\dfrac{6}{7}\) . \(\dfrac{1}{15}\) = \(\dfrac{6}{105}\)
a) Tính
\(\dfrac{7}{9}\)x\(\dfrac{5}{6}\)=\(\dfrac{35}{54}\)
\(\dfrac{1}{5}\):\(\dfrac{7}{10}\)=\(\dfrac{2}{7}\)
\(\dfrac{6}{7}\)x(\(\dfrac{2}{3}-\dfrac{3}{5}\))=2/35
\(\dfrac{3}{5}\) + \(\dfrac{1}{2}\) \(-\)\(\dfrac{3}{10}\) = \(\dfrac{6}{10}\) + \(\dfrac{5}{10}\) =\(\dfrac{11}{10}\) \(-\)\(\dfrac{3}{10}\) = \(\dfrac{7}{10}\)
1 \(-\) ( \(\dfrac{2}{5}\) + \(\dfrac{1}{3}\) )
1 \(-\) \(\dfrac{11}{15}\)
= \(\dfrac{4}{15}\)
\(x +\) \(\dfrac{1}{4}\) = \(\dfrac{5}{8}\)
\(x =\) \(\dfrac{5}{8}\)\(-\)\(\dfrac{1}{4}\)
\(x =\) 12 / 32
x - 3 / 5 = 1 / 10
x = 1 / 10 + 3 / 5
x = 35 / 50
7 / 8 - x = 1 / 4
x = 7 / 8 - 1 / 4
= 5 / 8
4 và 5
