evaluate using identities:1003 into 995
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= (1000 + 3)×(1000 - 5)
= 1000000 - 5000 + 3000 - 15
= 1000000 - 2000 - 15
= 997985
= 1000000 - 5000 + 3000 - 15
= 1000000 - 2000 - 15
= 997985
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