a)
64=8×8=8^2 => pătrat perfect
b)
121=11×11=11^2 => pătrat perfect
c)
10000=100×100=100^2 => pătrat perfect
d)
11=??
e)
21^17:21^13=21^4=21^2•2=(21^2)^2 => pătrat perfect
f)
17^13•17^19=17^32=17^16•2=(17^16)^2 => pătrat perfect
g)
(7^3)^6=7^18=7^9•2=(7^9)^2 => pătrat perfect
La d) nu am ce face, este doar 11, nu are cum să fie pătrat perfect.