Question

Va rog frumos ,punctul i!

Answer 1

(5/9)de 25 de ori* (5/9) de 22 de ori= (5/9) de 22+25 de ori= (5/9) de 47 de ori

((5/9) de 15 ori) de 3 ori= (5/9) de 15*3 ori=(5/9) de 45 de ori

(5/9) de 47 de ori: (5/9) de 45 de ori=

(5/9) de 47-45 de ori= (5/9) de 2 ori= 25/81

coroana?

Answer 2

 

$\displaystyle\bf\\i)\\\\\left(\frac{5}{9}\right)^{25}\times\left(\frac{5}{9}\right)^{22}:\left[\left(\frac{5}{9}\right)^{15}\right]^3=\\\\\\=\left(\frac{5}{9}\right)^{25}\times\left(\frac{5}{9}\right)^{22}:\left(\frac{5}{9}\right)^{15\times3}=\\\\\\=\left(\frac{5}{9}\right)^{25}\times\left(\frac{5}{9}\right)^{22}:\left(\frac{5}{9}\right)^{45}= \\\\\\=\left(\frac{5}{9}\right)^{25+22-45}=\left(\frac{5}{9}\right)^{47-45}=\left(\frac{5}{9}\right)^2=\frac{5^2}{9^2}=\boxed{\bf\frac{25}{81}}$