Question

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Answer 1

Răspuns:

Explicație pas cu pas:

x = 5a

y = 5b

z = 5c

5x + 3y + 2z = 25a + 15b + 10c = 5(5a + 3b + 2c) = 5*45 = 225

Answer 2

$\dfrac{a}{x}=\dfrac{b}{y}=\dfrac{c}{z} = \dfrac{1}{5} \Rightarrow \dfrac{x}{a}=\dfrac{y}{b} = \dfrac{z}{c} = 5 \Rightarrow x = 5a,~y = 5b,~z = 5c\\ \\ 5a+3b+2c = 45\\ \\E =5x+3y+2z = 5(5a)+3(5b)+2(5c) = 5(5a+3b+2c) = 5\cdot 45 \\ \\ \Rightarrow \boxed{E =225}$