Question

\(\frac{-7}{15}+\frac{5}{31}+\frac{-8}{15}+\frac{26}{31}\)

Answer 1

\(-\frac{7}{15}+\frac{5}{31}+\frac{-8}{15}+\frac{26}{31}=\frac{-7-8}{15}+\frac{5+26}{31}\)

                                                       \(=\frac{-15}{15}+\frac{31}{31}\)

                                                      \(=-1+1\)

                                                    = 0 

Answer 2

\(\left(\frac{-7}{15}\right)+\frac{5}{31}+\left(\frac{-8}{15}\right)+\frac{26}{31}\)

\(=\left[\left(\frac{-7}{15}\right)+\left(\frac{-8}{15}\right)\right]+\left(\frac{5}{31}+\frac{26}{31}\right)\)

\(=\frac{-15}{15}+\frac{31}{31}\)

\(=-1+1\)

\(=0\)

Answer 3

\(\frac{-7}{15}+\frac{5}{31}+\frac{-8}{15}+\frac{26}{31}\)

\(=\left(\frac{-7}{15}+\frac{-8}{15}\right)+\left(\frac{5}{31}+\frac{26}{31}\right)\)

\(=\frac{-15}{15}+\frac{31}{31}\)

\(=\left(-1\right)+1=0\)

Answer 4

=(     \(\frac{-7}{15}+\frac{-8}{15}\)) + (  \(\frac{5}{31}+\frac{26}{31}\))

=(-1) + 1

=0