Question

Thực hiện phép tính

a) 6\(\dfrac{5}{12}\): 2\(\dfrac{3}{4}\)+ 11\(\dfrac{1}{4}\). ( \(\dfrac{1}{3}\)- \(\dfrac{1}{5}\))

b) ( \(\dfrac{3}{5}\)+ 0,415 - \(\dfrac{3}{200}\)) . 2\(\dfrac{2}{3}\). 0,25

c) \(1\dfrac{13}{15}\). 0,75 - ( \(\dfrac{11}{20}\)+ 25% ) : \(\dfrac{7}{3}\)

GIÚP MÌNH VỚI !!

Answer 1

a: \(=\dfrac{77}{12}:\dfrac{11}{4}+\dfrac{45}{4}\cdot\dfrac{2}{15}\)

\(=\dfrac{77}{12}\cdot\dfrac{4}{11}+\dfrac{3}{2}\)

\(=\dfrac{7}{3}+\dfrac{3}{2}=\dfrac{23}{6}\)

b: \(=\left(\dfrac{3}{5}+\dfrac{415}{1000}-\dfrac{3}{200}\right)\cdot\dfrac{8}{3}\cdot\dfrac{1}{4}\)

\(=\dfrac{600+415-15}{1000}\cdot\dfrac{2}{3}=\dfrac{2}{3}\)

c: \(=\dfrac{28}{15}\cdot\dfrac{3}{4}-\left(\dfrac{11}{20}+\dfrac{4}{20}\right)\cdot\dfrac{3}{7}\)

\(=\dfrac{7}{5}-\dfrac{3}{4}\cdot\dfrac{3}{7}=\dfrac{7}{5}-\dfrac{9}{28}=\dfrac{151}{140}\)