Question

[Minecraft animation]

b1: tính 

a)\(\dfrac{5}{-14}\) . \(\dfrac{-7}{10}\)

b) \(\dfrac{-15}{4}\) . \(\dfrac{-16}{25}\) 

c) 15 . (\(\dfrac{-13}{16}\))

d) \(\dfrac{-5}{14}\) . \(\dfrac{-7}{15}\)

Answer 1

[Nguyễn Phương Lê]

a,-35/-140

b,240/100

c,500/16

d,35/210

sau bạn tự rút gọn nhớ mình hơi lười

Answer 2

[Citii?]

\(a.\) \(\dfrac{5}{-14}\cdot\dfrac{-7}{10}\)

\(=\dfrac{5}{2}\cdot\dfrac{1}{10}\)

\(=\dfrac{1}{2}\cdot\dfrac{1}{2}\)

\(=\dfrac{1}{4}\)

\(b.\) \(\dfrac{-15}{4}\cdot\dfrac{-16}{25}\)

\(=\dfrac{-3}{1}\cdot\dfrac{-4}{5}\)

\(=\dfrac{12}{5}\)

\(c.\) \(15\cdot\left(\dfrac{-13}{16}\right)\)

\(=\dfrac{15}{1}\cdot\dfrac{-13}{16}\)

\(=\dfrac{-195}{16}\)

\(d.\) \(\dfrac{-5}{14}\cdot\dfrac{-7}{15}\)

\(=\dfrac{-1}{2}\cdot\dfrac{-1}{3}\)

\(=\dfrac{1}{6}\)