\(\frac{5.7.13}{26+5.13}=\frac{5.7.13}{13.2+5.13}=\frac{5.7.13}{13.\left(2+5\right)}=\frac{13.7.5}{13.7}=\frac{5}{1}=5\)

\(\frac{5.7.13}{26+5.13}\) \(=\frac{7}{26}\)

\(\frac{5.7.13}{26+5.13}=\frac{5.7.13}{2.13+5.13}=\frac{5.7.13}{\left(2+5\right).13}=\frac{5.7.13}{7.13}=5\)

b)\(\frac{5.7.133}{26+5.13}\)

Ta có:\(\frac{5.7.19.7}{13.2+5.13}\)

           \(\frac{5.7.7.19}{13.\left(2+5\right)}\)

             \(\frac{5.7.7.19}{13.7}\)

             \(\frac{5.7.19}{13}=\frac{35.19}{13}\)

\(\frac{3}{7}.\frac{9}{26}-\frac{1}{14}.\frac{1}{13}\)

\(=\frac{27}{182}-\frac{1}{182}\)

\(=\frac{1}{7}\)

\(\frac{3}{5}.\frac{13}{46}-\frac{1}{10}.\frac{16}{23}\)

\(=\frac{6}{10}.\frac{13}{46}-\frac{1}{10}.\frac{16}{23}\)

\(=\frac{1}{10}.\frac{78}{46}-\frac{1}{10}.\frac{16}{32}\)

\(=\frac{1}{10}\left(\frac{78}{46}-\frac{32}{46}\right)\)

\(=\frac{1}{10}.1=\frac{1}{10}\)

\(\frac{-11^5.13^7}{11^5.13^8}=\frac{-11^4.\left(-11\right).13^7}{11^4.11.13^7.13}=\frac{-11}{11.13}=\frac{-11}{143}\)

bằng -1/13

                                      ko tik xui nguyên năm gán chịu

\(=\frac{-1}{13}\)

\(\frac{11^5.13^7}{10^5.13^8}=\frac{11^5.13^7}{10^5.13^7.13}=\frac{11^5}{10^5.13}=\frac{11^5}{10^5}:13=\left(\frac{11}{10}\right)^5:13\)

mình chỉ rút gọn đc đến đây thui, còn lại mình ....... ko biết

\(\frac{-11^5.13^7}{11^5.13^8}=-\frac{11^5.13^7}{11^5.13^7.13}=-\frac{1}{13}\)

\(\frac{-1}{3}\)     KS NHA

= -11⁵ * 13⁷ /  11⁵ * 13⁷ * 13 = -1/13

\(\frac{\left(-11\right)^5.13^7}{11^5.13^8}=\frac{\left(-11\right)^5.13^7}{11^5.13^7}.\frac{1}{13}=-1.\frac{1}{13}=-\frac{1}{13}\)

(-11)⁵x13⁷/11⁵.13⁸=-1/13⁸

Chúc bạn học giỏi nha!!!

\(\frac{\left(-1\right).1}{1.13}=\frac{\left(-1\right)}{13}\)