Question

URGENT !!! COROANA !!! Problema 29

Answer 1

Salut,

Proprietățile proporțiilor:

$\dfrac{x}{a}=\dfrac{y}{b}=\dfrac{z}{c}=\dfrac{t}{d}=\dfrac{u}{e}=\dfrac{x+y+z+t+u}{a+b+c+d+e}=10,\\\\deci\ 10^2-\dfrac{x+y+z+t+u}{a+b+c+d+e}=10^2-10=90.$

Green eyes.