Вычислите, не пользуясь калькулятором:
1)

3, 74^{2} + 3, 74 * 2, 26 - 3, 74 * 1, 24 - 2, 26 * 1, 24

;
2)

58, 7 * 1, 2 + 36 * 3, 52 - 34, 7 * 1, 2 - 2, 32 * 36

;
3)

2 \frac{4}{9} * 3 \frac{2}{7} + 1 \frac{5}{7} * 2, 8 + 2 \frac{5}{9} * 3 \frac{2}{7} + 1 \frac{5}{7} * 2, 2

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Алгебре 7 класс Мерзляк. Номер №482

3, 74^{2} + 3, 74 * 2, 26 - 3, 74 * 1, 24 - 2, 26 * 1, 24 = (3, 74^{2} + 3, 74 * 2, 26) - (3, 74 * 1, 24 + 2, 26 * 1, 24) = 3, 74 (3, 74 + 2, 26) - 1, 24 (3, 74 + 2, 26) = (3, 74 + 2, 26) (3, 74 - 1, 24) = 6 * 2, 5 = 15

58, 7 * 1, 2 + 36 * 3, 52 - 34, 7 * 1, 2 - 2, 32 * 36 = (58, 7 * 1, 2 - 34, 7 * 1, 2) + (36 * 3, 52 - 2, 32 * 36) = 1, 2 (58, 7 - 34, 7) + 36 (3, 52 - 2, 32) = 1, 2 * 24 + 36 * 1, 2 = 1, 2 (24 + 36) = 1, 2 * 60 = 72

2 \frac{4}{9} * 3 \frac{2}{7} + 1 \frac{5}{7} * 2, 8 + 2 \frac{5}{9} * 3 \frac{2}{7} + 1 \frac{5}{7} * 2, 2 = (2 \frac{4}{9} * 3 \frac{2}{7} + 2 \frac{5}{9} * 3 \frac{2}{7}) + (1 \frac{5}{7} * 2, 8 + 1 \frac{5}{7} * 2, 2) = 3 \frac{2}{7} (2 \frac{4}{9} + 2 \frac{5}{9}) + 1 \frac{5}{7} (2, 8 + 2, 2) = 3 \frac{2}{7} * 5 + 1 \frac{5}{7} * 5 = 5 (3 \frac{2}{7} + 1 \frac{5}{7}) = 5 * 5 = 25

ГДЗ Алгебра 7 класс Мерзляк, Полонский, Якир