Question

a) \(\dfrac{37}{40}\)-0,64

b)130\(\dfrac{25}{28}\)-120\(\dfrac{12}{35}\)

c) 1-\(\dfrac{1}{2}\)-\(\dfrac{1}{3}\)-\(\dfrac{1}{6}\)

d)\(\dfrac{17}{8}\)-\(\dfrac{11}{6}\)+\(\dfrac{2}{9}\)

e) \(\dfrac{21}{28}\)-\(\dfrac{18}{60}\)+\(\dfrac{3}{5}\)

Answer 1

a) \(\dfrac{37}{40}-0,64\\ =\dfrac{37}{40}-\dfrac{16}{25}\\ =\dfrac{185}{200}-\dfrac{128}{200}\\ =\dfrac{57}{200}\)

Answer 2

b) \(130\dfrac{25}{28}-120\dfrac{12}{35}\\ =\dfrac{3665}{28}-\dfrac{4212}{35}\\ =\dfrac{18325}{140}-\dfrac{16848}{140}\\ =\dfrac{211}{20}\)

Answer 3

\(1-\dfrac{1}{2}-\dfrac{1}{3}-\dfrac{1}{6}\\ =\dfrac{6}{6}-\dfrac{3}{6}-\dfrac{2}{6}-\dfrac{1}{6}\\ =\dfrac{0}{6}\\ =0\)

Answer 4

d) \(\dfrac{17}{8}-\dfrac{11}{6}+\dfrac{2}{9}\\ =\dfrac{153}{72}-\dfrac{132}{72}+\dfrac{16}{72}\\ =\dfrac{37}{72}\)

Answer 5

e) \(\dfrac{21}{28}-\dfrac{18}{60}+\dfrac{3}{5}\\ =\dfrac{3}{4}-\dfrac{3}{10}+\dfrac{3}{5}\\ \dfrac{15}{20}-\dfrac{6}{20}+\dfrac{12}{20}\\ =\dfrac{21}{20}\)