Question

[phamthithucoanh]

a, -3/7 + 15/26 - 2/13 + 3/7

b,2.3/7 - 5/3 : 1/9 - 3/7

giúp em vs ạ đề là thực hiện phép tính 

Answer 1

[Tôi bị trĩ , giúp tôi với ( team tr...]

 a.    \(\frac{-3}{7}+\frac{15}{26}-\frac{2}{13}+\frac{3}{7}\)

\(=\left(\frac{-3}{7}+\frac{3}{7}\right)+\frac{15}{26}-\frac{2}{13}\)

\(=\frac{15}{26}-\frac{2}{13}\)

\(=\frac{15}{26}-\frac{4}{26}=\frac{11}{26}\)

b.    \(\frac{3}{7}-\frac{5}{3}\div\frac{1}{9}-\frac{3}{7}\)

\(=\frac{3}{7}-\frac{5}{3}\times\frac{9}{1}-\frac{3}{7}\)

\(=\frac{3}{7}-15-\frac{3}{7}\)

\(=-15\)

Answer 2

[Nguyễn Hải Minh]

\(-\frac{3}{7}+\frac{15}{26}-\frac{2}{13}+\frac{3}{7}=\frac{15}{26}-\frac{2}{13}=\frac{11}{26}\)

\(\frac{2.3}{7}-\frac{5}{3}:\frac{1}{9}-\frac{3}{7}=\frac{6}{7}-15-\frac{3}{7}=\frac{3}{7}-15=-\frac{102}{7}\)