What does two and five fiths equal to

2 and five fifths = 3

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1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0

explanation:

previous steps have made pa≅ pb ≅ st ≅ su. setting the compass width to ab allows you to make tu the same length. then δstu ≅ δpab by the sss congruence postulate, and ∠p ≅ ∠s by the reason cpctc.