Odpowiedź :
23
x23
______
69
+46
_____
529
23² = 529
999
x999
________
8991
+ 8991
+ 8991
_______
998001
999² = 998001
x23
______
69
+46
_____
529
23² = 529
999
x999
________
8991
+ 8991
+ 8991
_______
998001
999² = 998001