Упр.877 ГДЗ Ткачёва 5 класс (Математика)

1) 2 1/19 + 1 3/19 — 7/19; 2) 3 2/15 + 2 7/15 — 14/15;
3) 7 5/8 — 5 7/8 + 1 1/8; 4) 6 3/11 — 2 9/11 + 1 2/11;
5) 10 2/9 — 3 4/9 — 1 5/9; 6) 8 1/7 — 1 3/7 + 5 6/7.

1) $$2\frac{1}{19}+1\frac{3}{19}-\frac{7}{19}=3\frac{4}{19}-\frac{7}{19}=2\frac{23}{19}-\frac{7}{19}=2\frac{16}{19}$$

2) $$3\frac{2}{15}+2\frac{7}{15}-\frac{14}{15}=5\frac{9}{15}-\frac{14}{15}=4\frac{24}{15}-\frac{14}{15}=4\frac{10}{15}$$

3) $$7\frac{5}{8}-5\frac{7}{8}+1\frac{1}{8}=6\frac{13}{8}-5\frac{7}{8}+1\frac{1}{8}=1\frac{6}{8}+1\frac{1}{8}=2\frac{7}{8}$$

4) $$6\frac{3}{11}-2\frac{9}{11}+1\frac{2}{11}=5\frac{14}{11}-2\frac{9}{11}+1\frac{2}{11}=3\frac{5}{11}+1\frac{2}{11}=4\frac{7}{11}$$

5) $$10\frac{2}{9}-3\frac{4}{9}-1\frac{5}{9}=9\frac{11}{9}-3\frac{4}{9}-1\frac{5}{9}=6\frac{7}{9}-1\frac{5}{9}=5\frac{2}{9}$$

6) $$8\frac{1}{7}-1\frac{3}{7}+5\frac{6}{7}=7\frac{8}{7}-1\frac{3}{7}+5\frac{6}{7}=6\frac{5}{7}+5\frac{6}{7}=11\frac{11}{7}=12\frac{4}{7}$$

Ответ

1) $$2\frac{16}{19}$$; 2) $$4\frac{10}{15}$$; 3) $$2\frac{7}{8}$$; 4) $$4\frac{7}{11}$$; 5) $$5\frac{2}{9}$$; 6) $$12\frac{4}{7}$$.