[tex] {45}^{23} \times {9}^{23} \div {5}^{21} = \\ = \frac{ {45}^{23} \times {9}^{23} }{ {5}^{21} } \\ = \frac{(45 \times 9)^{23} }{ {5}^{21} } \\ = \frac{ {405}^{23} }{ {5}^{21} } \\ = \frac{ {81}^{23} \times {5}^{23} }{ {5}^{21} } \\ = {81}^{23} \times {5}^{2} \\ = {81}^{23} \times 25[/tex]
Si daca mai vrei, poti sa il scrii pe 81 ca 9^2
=> (9^2)^23 × 25 = 9^46 ×25
