Răspuns :
25^4 = (5^2)^4 = 5^8
[tex]5^{8}*5^{8}/5^{9} *5^{8} /5^{10} = 5^{16} *5^{8} /5^{19} = 5^{24} /5^{19} = 5^{5}[/tex]
= (5^2)^4 × 5^8 : 5^9 × 5^8 : 5^10 =
= 5^8 × 5^8 : 5^9 × 5^8 : 5^10 =
= 5^16 : 5^9 × 5^8 : 5^10 =
= 5^7 × 5^8 : 5^10 =
= 5^15:5^10 =
=5^5