ГДЗ Алгебра 8 клас Істер (2025)

Обчисліть

1) 1/7 + 3/7 = 4/7; 3) 9/11 – 5/11 = 4/11;
5) 4/5 + 1/5 = 5/5 = 1; 7) –3/10 – 7/10 = –10/10 = –1;
2) 7/13 + 8/13 = 15/13 = 12/13; 4) 3/17 – 9/17 = –6/17;
6) –11/15 + 2/15 = –9/15 = –3/5; 8) –2/7 – (–1/7) = –2/7 + 1/7 = –1/7.