Question

Решите пожалуйста, очень нужно!
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Answer 1

Ответ:

1.

$\\\\ \frac{1}{4} a-\frac{2}{3}b-\frac{5}{6}a+\frac{3}{4}b \\\\ a=-1\frac{2}{7}; b=-36;\\\\\frac{1}{4} a-\frac{5}{6}a-\frac{2}{3}b+\frac{3}{4}b\\\\\frac{3-10}{12} a-\frac{8+9}{12}b=-\frac{7}{12} a+\frac{1}{12}b\\\\-\frac{7}{12} *(-1\frac{2}{7})+\frac{1}{12}*(-36)\\\\-\frac{7}{12} *(-\frac{9}{7})+\frac{1}{12}*(-36)\\\\\frac{3}{4} - 3 = -\frac{9}{4}$

2.

0,5 (1,6x - 6.4y) - 2.4 (1.5x + y);   x = 3; y = -4.5;

0.8x - 3.2y - 3.6x - 2.4y = -2.8x - 5.6y = -2.8 * 3 - 5.6 * (-4.5) = -8.4 + 25.2 = 16.8

3.

$-\frac{5}{8}(3.2m - 1\frac{3}{5}n ) - 7.2 (-\frac{4}{9}m + 2.5n)$;             m = -10; n = -0.1

$-\frac{5}{8}(\frac{32}{10} m - \frac{8}{5}n ) - \frac{72}{10} (-\frac{4}{9}m + \frac{25}{10} n)\\\\\\-2m + n + \frac{16}{5} m - 18n = -2 * (-10) - 0.1 + \frac{16}{5} * (-10) - 18 * (-0.1) = 20 - 0.1 - 32 + 1.8 = -10.3$

Пошаговое объяснение: