evaluate using identities 999square
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(999)^2=(1000-1)^2.
=(1000)^2-2×1000×1+(1)^2
=1000000-2000+1.
=1000000-1999
=998001.
Hope this helps.
=(1000)^2-2×1000×1+(1)^2
=1000000-2000+1.
=1000000-1999
=998001.
Hope this helps.
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