\(\frac{3}{5}-\frac{7}{45}+\frac{11}{9.13}-\frac{15}{13.17}+\frac{19}{17.21}-\frac{23}{21.25}\)
\(=\frac{3}{5}-\frac{7}{45}+\frac{11}{117}-\frac{15}{221}+\frac{19}{357}-\frac{23}{42}\)
\(=\left(\frac{-7}{45}-\frac{15}{221}-\frac{23}{42}\right)+\left(\frac{3}{5}+\frac{11}{117}+\frac{19}{357}\right)\)
đến đây bạn tự tính nhé.