Question

Tính tích và viết kết quả ở dạng phân số tối giản:

a) \(\dfrac{-5}{9}\cdot\dfrac{12}{35};\)

b) \(\left(-\dfrac{5}{8}\right)\cdot\dfrac{-6}{55};\)

c) \(\left(-7\right)\cdot\dfrac{2}{5};\)

d) \(\dfrac{-3}{8}\cdot\left(-6\right).\)

Answer 1

\(a.\)

\(-\dfrac{5}{9}\cdot\dfrac{12}{35}=\dfrac{\left(-5\right)\cdot12}{9\cdot35}=\dfrac{-60}{315}=-\dfrac{4}{21}\)

\(b.\)

\(\left(-\dfrac{5}{8}\right)\cdot-\dfrac{6}{55}=\dfrac{\left(-5\right)\cdot\left(-6\right)}{8\cdot55}=\dfrac{30}{440}=\dfrac{3}{44}\)

\(c.\)

\(\left(-7\right)\cdot\dfrac{2}{5}=-\dfrac{14}{5}\)

\(d.\)

\(-\dfrac{3}{8}\cdot\left(-6\right)=\dfrac{-3\cdot\left(-6\right)}{8}=\dfrac{18}{8}=\dfrac{9}{4}\)

Answer 2

a,-4/21 b,-3/44 c,-14/5 d,9/4

Answer 3

a) \(\dfrac{-5}{9}.\dfrac{12}{35}=\dfrac{-5.12}{9.35}=\dfrac{-4}{21}\) 

b) \(\dfrac{-5}{8}.\dfrac{-6}{55}=\dfrac{-5.-6}{8.55}=\dfrac{3}{44}\) 

c)\(-7.\dfrac{2}{5}=\dfrac{-7.2}{5}=\dfrac{-14}{5}\) 

d) \(\dfrac{-3}{8}.-6=\dfrac{-3.-6}{8}=\dfrac{9}{4}\)