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7.6 3. 5 5/7 × 4 4/9. (А-5 8/21)+1 3/7=8. 4 5 6 7. Б) (2 2/7 *3,8*1 1/5): (1, 9 * 2 2/5 * 9 1/7).
5 5/7 × 4 4/9. (А-5 8/21)+1 3/7=8. 4 5 6 7. Б) (2 2/7 *3,8*1 1/5): (1, 9 * 2 2/5 * 9 1/7).

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