Question

Tính :

\(\frac{72^2}{24^2};\frac{\left(-7,5\right)^3}{\left(2,5\right)^3};\frac{15^3}{27}\)

Answer 1

\(\frac{72^2}{24^2}=\frac{3^2.24^2}{24^2}=3^2=9\)

\(\frac{\left(-7,5\right)^2}{2,5^2}=\frac{\left(7,5\right)^2}{\left(2,5\right)^2}=\frac{\left(2,5\right)^2.3^2}{\left(2,5\right)^2}=9\)

\(\frac{15^2}{27}=\frac{3^2.5^2}{27}=\frac{9.25}{27}=\frac{25}{3}\)

Answer 2

\(\frac{72^2}{24^2}=\left(\frac{72}{24}\right)^2=3^2=9\)

\(\frac{\left(-7,5\right)^3}{\left(2,5\right)^3}=\left(\frac{-7,5}{2,5}\right)^3=\left(-3\right)^3=-27\)

\(\frac{15^3}{27}=\frac{15^3}{3^3}=\left(\frac{15}{3}\right)^3=5^3=125\)

Chúc bạn hok tốt 

Answer 3

Silver bullet bn bị sai đề kìa \(\frac{\left(-7,5\right)^3}{\left(2,5\right)^3}\) chứ ko phải \(\frac{\left(-7,5\right)^2}{\left(2,5\right)^2}\)