Question

РЕШИТЬ!
9/16(5 1/3x-2/3y)-7/20(2 6/7x-5 5/7y)

Answer 1

$\frac{9}{16} (5 \frac{1}{3} x - \frac{2}{3} y) - \frac{7}{20} (2 \frac{6}{7} x - 5 \frac{5}{7} y) = \\ = \frac{9}{16} (\frac{16}{3} x - \frac{2}{3} y) - \frac{7}{20} ( \frac{20}{7} x - \frac{40}{7} y) = \\ =3x - \frac{3}{8} y - x + 2y = \\ = 2x + 1 \frac{5}{8} y$