Question

найдите значение выражений (18целых1/4-17целых5/6)*8,4+6,5

Answer 1

Решение внизу на фото

Answer 2

$(18 \frac{1}{4} - 17 \frac{5}{6} ) \times 8.4 + 6.5 = \\ = (1 + \frac{1}{4} - \frac{5}{6} )\times 8.4 + 6.5 = \\ = (1 + \frac{3 - 10}{12}) \times 8.4 + 6.5 = \\ = \frac{5}{12} \times 8.4 + 6.5 = \\ = 5 \times \frac{8.4}{12} + 6.5 = \\\ = 5 \times 0.7 + 6.5 = 3.5 + 6.5 = 10$