3- [2- {2.9- (3.4-4.7)- 1.8}]
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Answer:
3-[2-{2.9- (-1.3)- 1.8}]
3-[2-{2.9 + 1.3 - 1.8}]
3-[2-{4.2 - 1.8}]
3-[2- 2.4]
3-[-0.4]
3+0.4
=3.4.
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