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Answer:
1) 100²- 99²
= (100+99) (100-99)
= 199×1
= 199
2) 27²-26²
= (27+26)(27-26)
= 53×1
= 53
3) 569²-568²
= (569+568) (569-568)
= 1137×1
= 1137
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