1: \(\frac23+\frac15\cdot\frac{10}{7}\)
\(=\frac23+\frac27\)
\(=\frac{14+6}{21}=\frac{20}{21}\)
2: \(\frac37+\frac{15}{26}-\left(\frac{2}{13}+\frac37\right)\)
\(=\frac37+\frac{15}{26}-\frac{2}{13}-\frac37\)
\(=\frac{15}{26}-\frac{2}{13}=\frac{15}{26}-\frac{4}{26}=\frac{11}{26}\)
3: \(\frac45\cdot\frac{-11}{13}+\frac45\cdot\frac{-2}{13}-\frac15\)
\(=\frac45\left(-\frac{11}{13}-\frac{2}{13}\right)-\frac15\)
\(=-\frac45-\frac15=-\frac55=-1\)
Đúng 0
Bình luận (0)
