Question

Daca
$\frac{x}{y} = \frac{3}{4}$
atunci
$\frac{2x + 5x}{5x - 3y}$
este egal cu:

Answer 1

x / y = 3 / 4

x / 3 = y / 4 = K

x / 3 = K => x = 3 K

y / 4 = K => y = 4 K

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( 2 · 3 K + 5 · 3 K ) / ( 5 · 3 K - 3 · 4 K ) =

= ( 6 K + 15 K ) / ( 15 K - 12 K )

= 21 K / 3 K

= 7