Răspuns :
[tex]23445*23445+(91*4000)*2=23445^{2} +364000*2=549668025+ \\ 728000=550396025.[/tex]
= 549 668 025 + 364 000 ×2
= 549 668 025 + 728 000
= 550 396 025.
= 549 668 025 + 728 000
= 550 396 025.