Răspuns:
[tex]\bf a)~~4^{8}\cdot 4^{7}= 4^{8+7}=\green{\boxed{\bf 4^{15}}}[/tex]
[tex]\bf b)~~9^{17}: 9^{13}= 9^{17-13}=\blue{\boxed{\bf 9^{4}}}[/tex]
[tex]\bf c)~~\big(19^{3}\big)^{10}= 19^{3\cdot10}=\purple{\boxed{\bf 19^{30}}}[/tex]
[tex]\bf d)~~2^{5}\cdot3^{5}= \big(2\cdot3\big)^{5}=\red{\boxed{\bf 6^{5}}}[/tex]
