Question

Помогите, пожалуйста.

Answer 1

$(2\frac{3}{4}+2\frac{1}{5})\cdot 16=(\frac{11}{4}+\frac{11}{5})\cdot 16=\frac{5\cdot 11+4\cdot 11}{4\cdot 5}\cdot 16=\\\\=\frac{11\cdot (5+4)}{5}\cdot 4=\frac{11\cdot 9}{5}\cdot 4=\frac{99\cdot 4}{5}=\frac{396}{5}=79,2$

Answer 2

-------------------------------------------------------
$(2 \frac{3}{4} + 2 \frac{1}{5} ) \times 16 = ( \frac{11}{4} + \frac{11}{5} ) \times 6 = \\ \\ = \frac{(55 + 44)}{20} \times 16 = \frac{99}{20} \times 16 = \\ \\ = \frac{99}{5} \times 4 = \frac{396}{5} = 79 \frac{1}{5}$
-------------------------------------------------------
Готово.
-------------------------------------------------------