Выполните действия:
1) 3/4-1/4 3) 7/12 -5/12 5) 3/10+1/10 7) 1/30+7/30
2) 5/8+ 3/8 4) 8/15+ 2/15 6) 17/25 - 12/25 8) 28/45 - 13/45
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