а)1-8/15=15/15-8/15=7/15
б)3-2/11=2цел.11/11-2/11=2цел.9/11
в)4-3цел.4/9=3цел.9/9-3цел.4/9=5/9
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а)1-8/15=15/15-8/15=7/15
б)3-2/11=2цел.11/11-2/11=2цел.9/11
в)4-3цел.4/9=3цел.9/9-3цел.4/9=5/9