Em chỉ đăng bài mình chưa làm được thui nhé!
Bài 1
a) \(3\dfrac{1}{2}+4\dfrac{5}{7}-5\dfrac{5}{14}\)
\(=\dfrac{7}{2}+\dfrac{33}{7}-\dfrac{75}{14}\)
\(=\dfrac{49}{14}+\dfrac{66}{14}-\dfrac{75}{14}\)
\(=\dfrac{40}{14}\)
\(=\dfrac{20}{7}\)
b) \(4\dfrac{1}{2}+\dfrac{1}{2}:5\dfrac{1}{2}\)
\(=\dfrac{9}{2}+\dfrac{1}{2}:\dfrac{11}{2}\)
\(=\dfrac{9}{2}-\dfrac{1}{11}\)
\(=\dfrac{99}{22}-\dfrac{2}{22}\)
\(=\dfrac{97}{22}\)
Bài 2
a) \(X\times3\dfrac{1}{3}=3\dfrac{1}{3}:4\dfrac{1}{4}\)
\(X\times\dfrac{10}{3}=\dfrac{10}{3}:\dfrac{17}{4}\)
\(X\times\dfrac{10}{3}=\dfrac{40}{51}\)
\(X=\dfrac{40}{51}:\dfrac{10}{3}\)
\(X=\dfrac{4}{17}\)
b) \(5\dfrac{2}{3}:X=3\dfrac{2}{3}-2\dfrac{1}{2}\)
\(\dfrac{17}{3}:X=\dfrac{11}{3}-\dfrac{5}{2}\)
\(\dfrac{17}{3}:X=\dfrac{7}{6}\)
\(X=\dfrac{17}{3}:\dfrac{7}{6}\)
\(X=\dfrac{34}{7}\)
