Ответ: 31/38.
1) 25:50 = 1/2;
2) 1/2 - 1/3 = 3/6 - 2/6 = 1/6;
3) 1/6 × 12/19 = 2/19;
4) 12/19 + 7/38 = 24/38 + 7/38 = 31/38.
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Ответ: 31/38.
1) 25:50 = 1/2;
2) 1/2 - 1/3 = 3/6 - 2/6 = 1/6;
3) 1/6 × 12/19 = 2/19;
4) 12/19 + 7/38 = 24/38 + 7/38 = 31/38.