Question

Giải dùm câu 14 và 15 với ạ , cảm ơn nhìu nhìu

Answer 1

Bài 14

a) \(\dfrac{-3}{7}x\dfrac{14}{9}=\dfrac{-42}{63}=\dfrac{-2}{3}\)

b) \(\dfrac{-5}{8}x\left(\dfrac{12}{7}+\dfrac{2}{7}\right)=\dfrac{-5}{8}x2=\dfrac{-5}{4}\)

c) \(=\dfrac{3}{4}-\dfrac{11}{4}+\dfrac{1}{2}=\dfrac{3}{4}-\dfrac{11}{4}+\dfrac{2}{4}=\dfrac{-6}{4}=\dfrac{-3}{2}\)

Bài 15

\(\dfrac{5}{2}.x=\dfrac{5}{3}\)

\(x=\dfrac{5}{3}:\dfrac{5}{2}\)

\(x=\dfrac{2}{3}\)

 

\(\dfrac{1}{3}.x-\dfrac{1}{2}=\dfrac{-2}{5}\)

\(\dfrac{1}{3}.x=\dfrac{-2}{5}+\dfrac{1}{2}\)

\(\dfrac{1}{3}x=\dfrac{1}{10}\)

\(x=\dfrac{1}{10}:\dfrac{1}{3}\)

\(x=\dfrac{3}{10}\)

Answer 2

cho mình sửa lại bài 14 câu c