Question

Fie proportia 18\x=y\5 . Atunci 2xy-1=?

Answer 1

Răspuns:

179

Explicație pas cu pas:

18/x=y/5

18*5=x*y

90=xy

2xy-1=2*90-1=180-1=179

Answer 2

$\it \dfrac{18}{x} = \dfrac{y}{5} \Rightarrow xy=18\cdot5 \Rightarrow xy = 90|_{\cdot2}\Rightarrow 2xy=180|_{-1}\Rightarrow 2xy-1=179$