(20 1\5 - b) - 6 1\3
если b = 11\2 15, то
(20 1\5 - 11 2\15) - 6 1\3 = 2 11\15
1) 20 1\5 - 11 2\15 = 20 3\15 - 11 2\15 = 9 1\15
2) 9 1\15 - 6 1\3 = 9 1\15 - 6 5\15 = 8 16\15 - 6 5\15 = 2 11\15
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(20 1\5 - b) - 6 1\3
если b = 11\2 15, то
(20 1\5 - 11 2\15) - 6 1\3 = 2 11\15
1) 20 1\5 - 11 2\15 = 20 3\15 - 11 2\15 = 9 1\15
2) 9 1\15 - 6 1\3 = 9 1\15 - 6 5\15 = 8 16\15 - 6 5\15 = 2 11\15