1)1/3-(+2/3); 2) -2/5-(-3/5); 3)-2/5-(-3/5); 4)-3/7-(+4/7); 5)5/8-(-7/8); 6)-1/9-(+2/9)

Ответ учителя по предмету Математика

1) 1/3 — (+2/3) = 1/3 — 2/3 = — 1/3

2) — 2/5 — (-3/5) = — 2/5 + 3/5 = 3/5 — 2/5 = 1/5

3) 2/5 — (-3/5) = 2/5 + 3/5 = 5/5 = 1

4) — 3/7 — (+4/7) = — 3/7 — 4/7 = — 7/7 = — 1

5) 5/8 — (-7/8) = 5/8 + 7/8 = 12/8 = 1 целая 4/8 = 1 целая 1/2

6) — 1/9 — (+2/9) = — 1/9 — 2/9 = — 3/9 = — 1/3