Question

Va rog rapid.... Rezolvare clasa a saptea ​

Answer 1

Răspuns:

2

Explicație pas cu pas:

notăm AB = x

atunci:

CD = AB + 2 = x + 2

BC = AB + 6 = x + 6

→ avem:

BD = BC + CD <=> 20 = x+2+x+6

2x = 20 - 8 => 2x = 12 => x = 6

→ deci:

AB = 6 cm

BC = 6 + 6 = 12 cm

→ raportul este:

$\frac{BC}{AB} = \frac{12}{6} = \red{ \bf 2}$

Answer 2

$\it Not\breve am\ AB=x \Rightarrow BC=x+6,\ \ CD=x+2\\ \\ BD=20 \Rightarrow x+6+x+2=20 \Rightarrow 2x+8=20\Big|_{:2} \Rightarrow x+4=10 \Rightarrow x=6\\ \\ \\ \dfrac{BC}{AB}=\dfrac{x+6}{6}=\dfrac{6+6}{6}=\dfrac{12}{6}=2$