Question

Giúp vs ạ

Answer 1

1)

\(\dfrac{13}{58}+\dfrac{5}{12}\)

\(=\dfrac{156}{696}+\dfrac{290}{696}\)

\(=\dfrac{223}{348}\)

2)

\(10-\dfrac{7}{12}\)

\(=\dfrac{10}{1}-\dfrac{7}{12}\)

\(=\dfrac{120}{12}-\dfrac{7}{12}\)

\(=\dfrac{113}{12}\)

3)

\(\dfrac{12}{17}:\dfrac{60}{51}\)

\(=\dfrac{12}{17}.\dfrac{51}{60}\)

\(=\dfrac{3}{5}\)

4)

\(\dfrac{3}{8}.\dfrac{5}{9}\)

\(=\dfrac{3.5}{8.9}\)

\(=\dfrac{5}{24}\)

Answer 2

a: \(=\dfrac{156+5\cdot58}{58\cdot12}=\dfrac{223}{348}\)

b: =120/12-7/12=113/12

c: \(=\dfrac{12}{17}\cdot\dfrac{51}{60}=\dfrac{12}{17}\cdot\dfrac{17}{20}=\dfrac{3}{5}\)

d: \(=\dfrac{15}{72}=\dfrac{5}{24}\)

Answer 3

\(\dfrac{13}{58}\) + \(\dfrac{5}{12}\) = \(\dfrac{78}{348}\) + \(\dfrac{30}{348}\) = \(\dfrac{108}{348}\) \(\dfrac{9}{29}\)

10 - \(\dfrac{7}{12}\) = \(\dfrac{120}{12}\) - \(\dfrac{7}{12}\) = \(\dfrac{113}{12}\)

\(\dfrac{12}{17}\) : \(\dfrac{60}{51}\) = \(\dfrac{12}{17}\) x \(\dfrac{51}{60}\) = \(\dfrac{12x17x3}{17x12x5}\) = \(\dfrac{3}{5}\)

\(\dfrac{3}{8}\) x \(\dfrac{5}{9}\) = \(\dfrac{3x5}{8x3x3}\) = \(\dfrac{5}{24}\)