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Mathematics

Answered

simplify
1) 8-(2+7)
2) 9-(2-7)
3) 8-(-2+7)
4) 8-(-2-7)

Answer :

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1). 8-9=-1
2). 9–9=18
3). 8–2+7=8+9
4). 8–2-7=8+5

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