Найдите значение выражения:
а)6/13+4/13-8/13 
б)7цел.13/15-(2цел.7/15+3цел.4/15)
в)(9цел.12/25-8цел. 16/25)+4цел. 17/25
P.S .../... дробь, ...цел. .../... смешанная дробь.
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