Question

...1.21.

 

Answer 1

a) -3/7 + 5/13 + -4/7 

= ( -3/7 + -4/7 ) + 5/13

= -7/7 +5/13

= -1 + 5/13

= -13/13 + 5/13

= -8/13

b) -5/21 + -2/21 + 8/24

= -7/21 + 8/24

= -1/3 + 1/3 

= 0

Answer 2

a) \(\frac{-3}{7}+\frac{5}{13}+\frac{-4}{7}\)

\(=\left(\frac{-3}{7}+\frac{-4}{7}\right)+\frac{5}{13}\)

\(=\left(-1\right)+\frac{5}{13}\)

\(=-1\frac{5}{13}\)

b) \(\frac{-5}{21}+\frac{-2}{21}+\frac{8}{24}\)

\(=\left(\frac{-5}{21}+\frac{-2}{21}\right)+\frac{1}{3}\)

\(=\frac{-1}{3}+\frac{1}{3}\)

\(=0\)