Question

81 ao quadrado menos 81 elevado a 1,75??

Answer 1

Oie, Td Bom?!

$81 {}^{2} - 81 {}^{1,75}$

$3 {}^{8} - 3 {}^{7}$

$6561 - 2187$

$4374$

Ajudei?! Dúvidas?! É Só Chamar!

Answer 2

cálculos auxiliares :

$\mathsf{1,75=\dfrac{175\div25}{100\div25}=\dfrac{7}{4}}$

$\mathsf{81={3}^{4}}$

$\mathsf{{81}^{1,75}={81}^{\frac{7}{4}}}\\=\mathsf{{({3}^{4})}^{\frac{7}{4}}={3}^{4.\frac{7}{4}}={3}^{7}=2187}$

${81}^{2}=6561$

Então

$\mathsf{{81}^{2}-{81}^{1,75}=6561-2187=4374}$