\(a.\frac{19}{13}+\frac{-7}{11}+\frac{-4}{11}-\frac{6}{13}\)
\(=\left(\frac{19}{13}-\frac{6}{13}\right)+\left(\frac{-7}{11}+\frac{-4}{11}\right)\)
\(=1+\left(-1\right)\)
\(=0\)
(19/13-6/13)+(-7/11+-4/11)
1+-1
0
\(a,\frac{19}{13}+\frac{-7}{11}+\frac{-4}{11}-\frac{6}{13}\)
\(=\left(\frac{19}{13}-\frac{6}{13}\right)-\left(\frac{7}{11}+\frac{4}{11}\right)\)
\(=1-1=0\)
-3/5.(10/13+3/13)+3/5
-3/5.1+3/5
-3/5+3/5
0
\(b.\frac{-3}{5}\times\frac{3}{13}+\frac{-3}{5}\times\frac{10}{13}+\frac{3}{5}\)
\(=\frac{3}{5}\times\frac{-3}{13}+\frac{3}{5}\times\frac{-10}{13}+\frac{3}{5}\times1\)
\(=\frac{3}{5}\times\left(\frac{-3}{13}+\frac{-10}{13}+1\right)\)
\(=\frac{3}{5}\times\left(-1+1\right)\)
\(=\frac{3}{5}\times0\)
\(=0\)
\(\frac{-3}{5}.\frac{3}{13}+\frac{-3}{5}.\frac{10}{13}+\frac{3}{5}\)
\(=\frac{-3}{5}\left(\frac{3}{13}+\frac{10}{13}\right)+\frac{3}{5}\)
\(=-\frac{3}{5}+\frac{3}{5}=0\)