Question

HELP MÌNH BÀI 2 CÂU 1 ; 2 ; 3 ; 4

Answer 1

Bài 2: 

1: \(=\dfrac{-6}{12}+\dfrac{-4}{12}+\dfrac{15}{12}=\dfrac{15-4-6}{12}=\dfrac{5}{12}\)

2: \(=\dfrac{10-4-7}{8}=\dfrac{-1}{8}\)

3: \(=\dfrac{2}{10}-\dfrac{5}{10}+\dfrac{9}{10}=\dfrac{6}{10}=\dfrac{3}{5}\)

4: \(=\dfrac{15}{12}-\dfrac{4}{12}+\dfrac{14}{12}=\dfrac{25}{12}\)