Question

Answer 1

Help me!!!!!!!!!!!!!!!!!!1

Answer 2

bài 1)

c)\(\dfrac{-2}{5}-\dfrac{-3}{11}\)

\(=\dfrac{-2}{5}+\dfrac{3}{11}\)

\(=\dfrac{-22}{55}+\dfrac{15}{55}\)

\(=\dfrac{-7}{55}\)

d)\(\dfrac{-5}{12}+0,75\)

\(=\dfrac{-5}{12}+\dfrac{75}{100}\)

\(=\dfrac{-5}{12}+\dfrac{3}{4}\)

\(=\dfrac{-5}{12}+\dfrac{9}{12}\)

\(=\dfrac{4}{12}\)

\(=\dfrac{1}{3}\)

c)\(\dfrac{5}{7}.12\dfrac{1}{2}-\dfrac{5}{7}.5\dfrac{1}{2}\)

\(=\dfrac{5}{7}\left(12\dfrac{1}{2}-5\dfrac{1}{2}\right)\)

\(=\dfrac{5}{7}.7\)

\(=\dfrac{35}{7}\)

\(=5\)