Question

i)\(\frac{25^9}{5^{16}}-5^3\div5\)

k)\(\frac{5}{7}-\left|\frac{2}{-7}\right|\)

l)\(\frac{3^6\times3^4}{9^3}\)

m)\(\frac{19}{42}+2019+1\frac{5}{27}+\frac{23}{42}-\frac{5}{27}\)

Answer 1

i) \(\frac{25^9}{5^{16}}-5^3:5\)

\(=\frac{\left(5^2\right)^9}{5^{16}}-5^2\)

\(=\frac{5^{18}}{5^{16}}-25\)

\(=5^2-25\)

\(=25-25\)

\(=0.\)

k) \(\frac{5}{7}-\left|\frac{2}{-7}\right|\)

\(=\frac{5}{7}-\left|\frac{-2}{7}\right|\)

\(=\frac{5}{7}-\frac{2}{7}\)

\(=\frac{3}{7}.\)

l) \(\frac{3^6.3^4}{9^3}\)

\(=\frac{3^{6+4}}{\left(3^2\right)^3}\)

\(=\frac{3^{10}}{3^6}\)

\(=3^4.\)

\(=81.\)

Chúc bạn học tốt!