Question

[MINH NGỌC Junnyka]

Giúp mình nhanh với ạ

Answer 1

[Lê Minh Vũ]

1 Tính:

1) \(\frac{2}{5}\)\(+\)\(\frac{7}{3}\)

\(=\)\(\frac{6}{15}\)\(+\)\(\frac{35}{15}\)

\(=\)\(\frac{41}{15}\)

2) \(\frac{6}{5}\)\(-\)\(\frac{2}{3}\)

\(=\)\(\frac{18}{15}\)\(-\)\(\frac{10}{15}\)

\(=\)\(\frac{8}{15}\)

c) \(\frac{7}{12}\)\(+\)\(\frac{4}{15}\)

\(=\)\(\frac{35}{60}\)\(+\)\(\frac{16}{60}\)

\(=\)\(\frac{51}{60}\)

\(=\)\(\frac{17}{30}\)

d) \(\frac{3}{8}\)\(+\)\(\frac{1}{12}\)

\(=\)\(\frac{9}{24}\)\(+\)\(\frac{2}{24}\)

\(=\)\(\frac{11}{24}\)

Answer 2

[Lê Minh Vũ]

2 Tính

1) \(\frac{2}{5}\)\(-\)\(\frac{1}{10}\)\(+\)\(\frac{1}{2}\)

\(=\)\(\frac{4}{10}\)\(-\)\(\frac{1}{10}\)\(+\)\(\frac{5}{10}\)

\(=\)\(\frac{3}{10}\)\(+\)\(\frac{5}{10}\)

\(=\)\(\frac{8}{10}\)

2) \(3-\frac{1}{4}\)\(+\frac{1}{6}\)

\(=\)\(\frac{36}{12}\)\(-\frac{3}{12}\)\(+\frac{2}{12}\)

\(=\)\(\frac{33}{12}\)\(+\frac{2}{12}\)

\(=\)\(\frac{35}{12}\)

3) \(4\)\(-\)\(\frac{2}{5}\)\(+\)\(\frac{3}{2}\)

\(=\)\(\frac{40}{10}\)\(-\)\(\frac{4}{10}\)\(+\)\(\frac{15}{10}\)

\(=\)\(\frac{36}{10}\)\(+\)\(\frac{15}{10}\)

\(=\)\(\frac{51}{10}\)

4) \(\frac{30}{45}\)\(+\)\(\frac{10}{70}\)\(-\)\(\frac{15}{30}\)

\(=\)\(\frac{2}{3}\)\(+\)\(\frac{1}{7}\)\(-\)\(\frac{1}{2}\)

\(=\)\(\frac{28}{42}\)\(+\)\(\frac{6}{42}\)\(-\)\(\frac{21}{42}\)

\(=\)\(\frac{34}{42}\)\(-\)\(\frac{21}{42}\)

\(=\)\(\frac{13}{42}\)