Question

1/2×(7/8-4)+6×7/8 памагити пж

Answer 1

Ответ:

$\frac{1}{2} ( \frac{7}{8} - 4) + 6 \times \frac{7}{8} = \\ = \frac{7}{16} - 2 + \frac{21}{4} = \\ = \frac{7 - 2 \times 16 + 21 \times 4}{16} = \\ = \frac{59}{16} = 3 \frac{11}{16}$

Answer 2

$\frac{1}{2} ( \frac{7}{8} - 4) + 6 \times \frac{7}{8 } = 3 \frac{11}{16} \\ \frac{7}{8} - 4 = \frac{7}{8} - 4 = \frac{7}{8} - 3 \frac{8}{8} = - 3 \frac{1}{8} \\ \frac{1}{2} \times ( - 3 \frac{1}{8} ) = - \frac{1 \times 25}{2 \times 8} = - \frac{25}{16} = - 1 \frac{9}{16} \\ 6 \times \frac{7}{8} = \frac{6 \times 7}{8} = \frac{3 \times 7}{4} = \frac{21}{4 } = 5 \frac{1}{4} \\ 5 \frac{1}{4} + ( - 1 \frac{9}{16} ) = 5 \frac{4}{16} - 1 \frac{9}{16} = 4 \frac{20}{16} - 1 \frac{9}{16} = 3 \frac{11}{16}$