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Bài này dễ:=\(\frac{3}{5}\)x \(\frac{1}{\frac{-1}{15}-\frac{1}{6}}\)+\(\frac{3}{5}\)x \(\frac{1}{\frac{-1}{3}-\frac{16}{15}}\).Tự giải tiếp nhé,nhớ chọn cho Long đẹp trai này nhé!
\(\frac{3}{5}:\left(-\frac{1}{15}-\frac{1}{6}\right)+\frac{3}{5}:\left(-\frac{1}{3}-\frac{16}{15}\right)\)
\(=\frac{3}{5}:\left(-\frac{7}{30}\right)+\frac{3}{5}:\left(-\frac{7}{5}\right)\)
\(=\frac{3}{5}.\left(-\frac{30}{7}\right)+\frac{3}{5}.\left(-\frac{5}{7}\right)\)
\(=\frac{3}{5}\left(-\frac{30}{7}-\frac{5}{7}\right)\)
\(=\frac{3}{5}.\left(-\frac{35}{7}\right)\)
\(=-3\)
a, (\(\dfrac{9}{10}\) - \(\dfrac{15}{16}\)) \(\times\) ( \(\dfrac{5}{12}\) - \(\dfrac{11}{15}\) - \(\dfrac{7}{20}\))
= (\(\dfrac{72}{80}\) - \(\dfrac{75}{80}\)) \(\times\) (\(\)\(\dfrac{25}{60}\) - \(\dfrac{44}{60}\) - \(\dfrac{21}{60}\))
= - \(\dfrac{3}{80}\) \(\times\) (- \(\dfrac{2}{3}\))
= \(\dfrac{1}{40}\)
b, (-1)3 + (- \(\dfrac{2}{3}\))2 : 2\(\dfrac{2}{3}\) + \(\dfrac{5}{6}\)
= -13 + \(\dfrac{4}{9}\) : \(\dfrac{8}{3}\) + \(\dfrac{5}{6}\)
= -1 + \(\dfrac{4}{9}\) \(\times\) \(\dfrac{3}{8}\) + \(\dfrac{5}{6}\)
= -1 + \(\dfrac{1}{6}\) + \(\dfrac{5}{6}\)
= -1 + 1
= 0
\(\dfrac{3}{5}:\left(\dfrac{-1}{15}-\dfrac{1}{6}\right)+\dfrac{3}{5}:\left(\dfrac{-1}{3}-\dfrac{16}{15}\right)\)
\(=\dfrac{3}{5}:\dfrac{-4}{15}+\dfrac{3}{5}:\dfrac{-7}{5}\)
\(=\dfrac{3}{5}.\dfrac{-15}{4}+\dfrac{3}{5}.\dfrac{-5}{7}\)
\(=\dfrac{3}{5}.\left(\dfrac{-15}{4}+\dfrac{-5}{7}\right)\)
\(=\dfrac{3}{5}.\dfrac{85}{28}\)
\(=\dfrac{51}{28}\)
Tick mk tiếp nha !!! (mk ko chắc là đúng đâu, nhớ tính lại nhé )