Question

full solution send kro​

Answer 1

Answer:

(I) 81² :

(80+1)²

a²+2ab+b²

180²+2(80)+1²

16400+160+4

=6561

(II) 999² :

(1000-1)²

1000² + 1²

1000000 +1 -2000

1000001-2000

=998001.

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