Câu hỏi của Nguyen Ngoc Lien

Question

Tính :

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

Isolde Moria · Accepted Answer

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

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

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

Câu trả lời:

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

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

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

Phan Cả Phát · Answer

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

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

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

Chúc bạn hok tốt

Câu trả lời:

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

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

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

Chúc bạn hok tốt