ГДЗ Математика 6 клас Істер — Вправа 471

1) $(9\frac{1}{4} - 8\frac{2}{3}) \cdot 1\frac{5}{7} + (4\frac{2}{9} - 2\frac{5}{6}) : 1\frac{1}{9} = 2,25;$

1) $9\frac{1}{4} - 8\frac{2}{3} = 9\frac{3}{12} - 8\frac{8}{12} = \frac{7}{12};$

2) $\frac{7}{12} \cdot 1\frac{5}{7} = \frac{7}{12} \cdot \frac{12}{7} = 1;$

3) $4\frac{2}{9} - 2\frac{5}{6} = 4\frac{4}{18} - 2\frac{15}{18} = 1\frac{7}{18};$

4) $1\frac{7}{18} : 1\frac{1}{9} = \frac{25}{18} \cdot \frac{9}{10} = \frac{5}{4} = 1,25;$

5) $1 + 1,25 = 2,25.$

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2) $2\frac{3}{11} \cdot \frac{7}{9} + 6\frac{8}{11} : 1\frac{2}{7} - 1\frac{1}{8} = 5,875;$

1) $6\frac{8}{11} : 1\frac{2}{7} = 6\frac{8}{11} \cdot \frac{7}{9};$

2) $2\frac{3}{11} \cdot \frac{7}{9} + 6\frac{8}{11} \cdot \frac{7}{9} = \frac{7}{9} \cdot (2\frac{3}{11} + 6\frac{8}{11}) = \frac{7}{9} \cdot 9 = 7;$

3) $7 - 1\frac{1}{8} = 6\frac{8}{8} - 1\frac{1}{8} = 5\frac{7}{8} = 5,875.$

Відповідь: 1) $2,25$; 2) $5,875$.