Question

Copiii au plantat 2 supra 18... exercitiul 9

Answer 1

$x - suprafata$

$\frac{2}{18} \times x = \frac{1}{9} \times x = \frac{x}{9} (rosii)$

$\frac{x}{9} + \frac{1}{18} = \frac{2x}{18} + \frac{1}{18} = \frac{2x + 1}{18} (ardei)$

$\frac{2x + 1}{18} + \frac{5}{18} = \frac{2x + 1 + 5}{18} = \frac{2x + 6}{18} = \frac{2(x + 3)}{18} = \frac{x + 3}{9} (castraveti)$

$\frac{x}{9} + \frac{2x + 1}{18} + \frac{x + 3}{9} = x \: | \times 18$

$2x + 2x + 1 + 2x + 6 = 18x$

$2x + 2x + 2x - 18x = - 1 - 6$

$- 12x = - 7 \: | \times ( - 1)$

$12x = 7$

$x = \frac{7}{12}$