Вопрос школьника по предмету Математика
5цел. 6/7-3цел 1/14
2цел.3/10-1цел.7/15
10-2цел. 2/9
Ответ учителя по предмету Математика
5 6/7 — 3 1/14 = 5 — 3 + (6/7 — 1/14) = 2 + (12/14 — 1/14) = 2 + 11/14 = 2 11/14
2 3/10 — 1 7/15 = 1 13/10 — 1 7/15 = 13/10 — 7/15 = 39/30 — 14/30 = 25/30 = 5/6
10 — 2 2/9 = 9 9/9 — 2 2/9 = 9 — 2 + (9/9 — 2/9 ) = 7 + 7/9 = 7 7/9
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