Question

puteti sa imi explicati la 1 , va rog

Answer 1

$\dfrac{7^{22}-7^{21}}{7^{25}-7^{24}}=\!\dfrac{7^{21}\cdot (7-1)}{7^{24}\cdot (7-1)} = \!{^{^{^{^{^{^{\displaystyle 7^{21})}}}}}}}\!{\dfrac{7^{21}}{7^{24}}} = \dfrac{1}{7^3} = \dfrac{1}{343}$

Answer 2

Răspuns:

Explicație pas cu pas:

7^22 - 7^21 = 7^21*(7 - 1) = 6*7^21

7^25 - 7^24 = 7^24*(7 - 1) = 6*7^24

fractia devine

6*7^21/6*7^24 = 1/7^3

___________

1 = 7*a

a = 1/7

1/7^3 = a^3