Completează:
a) 4×3⁶ + 7×3⁷ = ( )²;
b) 4×5²⁰+9×5²¹=( )² ;
c) 2¹⁰ +3×2¹⁰+ 5×4⁵ = ( )²
![Completeazăa 43 73 B 4595 C 2 32 54 class=](https://ro-static.z-dn.net/files/dd3/659d3c165e5fb3cd52cd68220d1f89dc.jpg)