Question

Va rog ajutatima dau coronita!
Ex. 28a),29a),36a)/197

Answer 1

28 a)
$\frac{8}{12} = \frac{3}{x} \\ x= \frac{12*3}{8} = \frac{36}{8} =4,5$
29 a)
$\frac{12}{5} = \frac{x}{20} \\ x= \frac{12*20}{5} = \frac{240}{5} =48$
36 a)
$\frac{x}{a} =5$ ⇒x=5a
$\frac{y}{b} =5$ ⇒y=5b
$\frac{z}{c} =5$ ⇒z=c5
$\frac{x+y+z}{a+b+c} = \frac{5a+5b+5c}{a+b+c} = \frac{5(a+b+c)}{a+b+c} =5$