Tinh bang cach hop li

a)  \(\left(\frac{1}{4}+\frac{-5}{13}\right)\)+ \(\left(\frac{2}{11}+\frac{-8}{13}+\frac{3}{4}\right)\)

b)\(\left(\frac{21}{31}+\frac{-16}{7}\right)\)+\(\left(\frac{44}{53}+\frac{10}{31}\right)+\frac{9}{53}\)

Tinh bang cach hop li nhat

\(\left(\frac{-5}{28}+1.75+\frac{8}{35}\right):\left(-3\frac{9}{20}\right)\)

tinh hop li :

                \(\frac{\left(\frac{1}{5}-\frac{2}{7}\right)\cdot\frac{3}{4}-\frac{3}{4}\cdot\left(\frac{1}{3}-\frac{2}{7}\right)}{\frac{1}{5}\cdot\frac{2}{7}-\frac{1}{3}\cdot\left(\frac{2}{7}+\frac{3}{9}\right)+\frac{3}{9}+\frac{1}{5}}\)

Tinh bang cach hop li

c)\(\frac{-5}{7}+\frac{3}{4}+\frac{-1}{5}+\) \(\frac{-2}{7}+\frac{1}{4}\)

• tinh

            \(\frac{0,8:\left(\frac{4}{5}.1,25\right)}{0,64-\frac{1}{25}}+\frac{\left(1,08-\frac{2}{25}\right):\frac{4}{7}}{\left(6\frac{5}{9}-3\frac{1}{4}\right).2\frac{2}{17}}+\left(1,2.0,5\right):\frac{4}{5}\) 

Tinh bang cach hop li

c) \(\frac{-5}{7}+\frac{3}{4}+\frac{-1}{5}\) \(+\frac{-2}{7}+\frac{1}{4}\)

tinh hop li :

                 \(\frac{\left(\frac{1}{5}-\frac{2}{7}\right)\cdot\frac{3}{4}-\frac{3}{4}\cdot\left(\frac{1}{3}-\frac{2}{7}\right)}{\frac{1}{5}\cdot\frac{2}{7}-\frac{1}{3}\cdot\left(\frac{2}{7}+\frac{3}{9}\right)+\frac{3}{9}+\frac{1}{5}}\)

cham la nhan nha cac ban 

ai nhanh mk tick cho

• tinh

       a,       \(\left(5\frac{2}{5}.7\frac{7}{12}\right).\left(13\frac{8}{9}.7\frac{5}{13}\right)\) 

       b,       \(\left(3\frac{2}{9}.\frac{15}{23}.1\frac{7}{29}\right):\frac{5}{23}\)