Question

(3 целых 2/3)^2 - (2 целых 1/3) ^2 вычислить

Answer 1

$3 \frac{2}{3} ^2-2 \frac{1}{3} ^2= \frac{11}{3}^2 - \frac{7}{3} ^2=( \frac{11}{3} - \frac{7}{3})(\frac{11}{3} + \frac{7}{3})= \frac{4}{3} * \frac{18}{3} =\frac{4}{3}*6=8$