\(\frac{-3}{7}+\frac{15}{26}-\left(\frac{2}{13}-\frac{3}{7}\right)=\frac{-3}{7}+\frac{15}{26}-\frac{2}{13}+\frac{3}{7}\)
\(=\left(\frac{-3}{7}+\frac{3}{7}\right)+\left(\frac{15}{26}-\frac{2}{13}\right)\)
\(=0+\left(\frac{15}{26}-\frac{4}{26}\right)\)
\(=\frac{11}{26}\)
\(\frac{-3}{7}+\frac{15}{26}-\left(\frac{2}{13}-\frac{3}{7}\right)\)
=\(\frac{-3}{7}+\frac{15}{26}-\left(\frac{-2}{13}\right)+\frac{3}{7}\)
=\(\frac{-3}{7}+\frac{15}{26}+\frac{2}{13}+\frac{3}{7}\)
=\(\left(\frac{-3}{7}+\frac{3}{7}\right)+\frac{15}{26}+\frac{2}{13}\)
=\(0+\frac{19}{26}\)
=\(\frac{19}{26}\)
Nếu đúng thì tk nha
\(-\frac{3}{7}+\frac{15}{26}-\left(\frac{2}{13}-\frac{3}{7}\right)=-\frac{3}{7}+\frac{15}{2\cdot13}-\frac{2\cdot2}{2\cdot13}+\frac{3}{7}=\frac{15-4}{2\cdot13}=\frac{11}{26}\)
\(\frac{-11}{23}\). \(\frac{6}{7}\)+ \(\frac{8}{7}\). \(\frac{-11}{23}\)- \(\frac{1}{23}\)