mk chỉ trả lời đk câu 1 thôi
\(\dfrac{3}{11}\). \(\dfrac{7}{19}\)
\(\dfrac{3}{11}\). \(\dfrac{7}{19}\)+ \(\dfrac{17}{11}\).\(\dfrac{3}{19}\)- \(\dfrac{3}{19}\). \(\dfrac{25}{11}\)
= \(\dfrac{3}{19}\). \(\dfrac{7}{11}\)+ \(\dfrac{17}{11}\).\(\dfrac{3}{19}\)- \(\dfrac{3}{19}\).\(\dfrac{25}{11}\)
= \(\dfrac{3}{19}\). ( \(\dfrac{7}{11}\)+ \(\dfrac{17}{11}\)- \(\dfrac{25}{11}\))
= \(\dfrac{3}{19}\). \(\dfrac{-1}{11}\)
= \(\dfrac{-3}{209}\)
mk chỉ lm đk bài này thôi, chúc bạn học tốt