Question

2. thực hiện phép tính

a \(\dfrac{17}{15}:\dfrac{4}{3}\)

b.\(\dfrac{-12}{21}:\dfrac{34}{43}\)

c.\(\dfrac{-5}{9}.\dfrac{3}{11}+\dfrac{13}{18}.\dfrac{3}{11}\)

d.\(\dfrac{-2}{9}.\dfrac{5}{11}+\dfrac{-16}{9}.\dfrac{5}{11}\)

Answer 1

a.\(\dfrac{17}{15}\div\dfrac{4}{3}=\dfrac{17}{20}\)

b.\(\dfrac{-12}{21}\div\dfrac{34}{43}=\dfrac{-86}{119}\)

c.\(\dfrac{-5}{9}\times\dfrac{3}{11}+\dfrac{13}{18}\times\dfrac{3}{11}\)

=\(\dfrac{3}{11}\times(\dfrac{-5}{9}+\dfrac{13}{18})=\dfrac{3}{11}\times\dfrac{1}{6}=\dfrac{1}{22}\)

d.\(\dfrac{-2}{9}\times\dfrac{5}{11}+\dfrac{-16}{9}\times\dfrac{5}{11}=\dfrac{5}{11}\times(\dfrac{-2}{9}+\dfrac{-16}{9})\)

=\(\dfrac{5}{11}\times(-2)=\dfrac{-10}{11}\)