Question

Допоможіть 64 завдання,будь ласка.

Answer 1

$5\frac{1}{3}*8\frac{7}{9}-2\frac{1}{3}*2\frac{2}{7}+5\frac{1}{3}*\frac{2}{9}-2\frac{1}{3}*6\frac{5}{7}=( 5\frac{1}{3}*8\frac{7}{9}+5\frac{1}{3}*\frac{2}{9})-(2\frac{1}{3}* 2\frac{2}{7}+2\frac{1}{3}*6\frac{5}{7})=\\\\= 5\frac{1}{3}*(8\frac{7}{9}+\frac{2}{9})-2\frac{1}{3}*(2\frac{2}{7}+6\frac{5}{7})=5\frac{1}{3}*9-2\frac{1}{3}*9=9*(5\frac{1}{3}-2\frac{1}{3})=9*3=\boxed{27}$