Question

7 задание..........?????????

Answer 1

18: ((2+1)+(3/9+6/9))+2,5*0,4

18: (2+1+1)+1

(18:4)+1

4,5+1=5,5

Answer 2

$18 \div (2 \times \frac{3}{9} + 1 \times \frac{6}{9} ) + 2.5 \times 0.4 = \\ \\ = 18 \div (2 \times \frac{1}{3} + \frac{6}{9} ) + 1 = \\ \\ = 18 \div \frac{2}{3} + \frac{6}{9} ) + 1 = \\ \\ 18 \div \frac{4}{3} + 1 = 18 \times \frac{3}{4} + 1 =$

$9 \times \frac{3}{2} + 1 = \frac{27}{2} + 1 = \frac{29}{2 \\ }$