\(\frac{\left(-7,5\right)^3}{2,5^3}=\left(\frac{-7,5}{2,5}\right)^3\)
\(=\left(-3\right)^3\)
\(=-27\)
\(\frac{\left(-7,5\right)^3}{\left(2,5\right)^3}=\frac{-7,5\cdot\left(-7,5\right)\cdot\left(-7,5\right)}{2,5\cdot2,5\cdot2,5}=-3\cdot\left(-3\right)\cdot\left(-3\right)=\left(-3\right)^3=-27\)
\(\frac{\left(-7,5\right)^3}{\left(2,5\right)^3}=\frac{-3\cdot\left(2,5\right)^3}{\left(2,5\right)^3}=-3\)
\(\frac{\left(-7,5\right)^3}{\left(2,5\right)^3}\)
\(=\frac{\left(-7,5\right)\cdot\left(-7,5\right)\cdot\left(-7,5\right)}{2,5\cdot2,5\cdot2,5}\)
\(=\left(-3\right)\cdot\left(-3\right)\cdot\left(-3\right)\)
\(=\left(-3\right)^3\)
\(=-27\)
\(\frac{\left(-7,5\right)^3}{\left(2,5\right)^3}\)=\(\left(\frac{-7,5}{2,5}\right)^3\)=\(\left(-3\right)^3\)=\(-27\)
mình sử dụng tính chất:lũy thừa của một thương
hok tốt
\(\frac{\left(-7,5\right)^3}{\left(2,5\right)^3}=\frac{\left(-3\times2,5\right)^3}{\left(2,5\right)}=\frac{\left(-3\right)^3\times\left(2,5\right)^3}{\left(2,5\right)^3}=-9\)
\(\frac{\left(-7,5\right)^3}{\left(2,5\right)^3}\)
\(=\left(\frac{-7,5}{2,5}\right)^3\)
\(=\left(-3\right)^3\)
\(=-27\)
Áp dụng công thức : \(\frac{a^m}{b^m}=\left(\frac{a}{b}\right)^m\)
\(\frac{\left(-7.5\right)^3}{2.5^3}=\frac{\left(-7.5\right)^3}{2.5}\)
\(\left(-3\right)^3\)
\(-27\)