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12.1 3. 17/15-1/12 20/3. 12/20*3. (17/15-1/12)Х20/3. (17/15-1/2)*20/3.
17/15-1/12 20/3. 12/20*3. (17/15-1/12)Х20/3. (17/15-1/2)*20/3.