Question

Mă ajutați vă rog am ex 1,2 de făcut dau coroană

Answer 1

$1)7.5 \: m \: ..... \: 45 \: lei \\ 11.25 \: m \: ..... \: x \: lei$

$x = \frac{11.25 \times 45}{7.5} = \frac{506.25}{7.5} = 67.5 \: lei$

$2)x - nr. \: total \: de \: pagini$

$\frac{1}{3} \times x = \frac{x}{3} \: (prima \: zi)$

$x - \frac{x}{3} = \frac{3x}{3} - \frac{x}{3} = \frac{2x}{3} \: (pagini \: necitite)$

$\frac{2}{3} \times \frac{2x}{3} = \frac{4x}{9} \: (a \: doua \: zi)$

$\frac{x}{3} + \frac{4x}{9} + 12 = x \: | \times 9$

$3x + 4x + 108 = 9x$

$7x + 108 = 9x$

$9x - 7x = 108$

$2x = 108$

$x = \frac{108}{2}$

$x = 54$