Question

daca x/y = 2/5 aflati 5x+y / 3x-y ​

Answer 1

Explicație pas cu pas:

x/y=2/5 => x=2k si y=5k

(5x+y)/(3x-y) =(10k+5k)/(6k-5k)=15k/k=15

Answer 2

Răspuns:

Explicație pas cu pas:

x/y = 2/5 ⇒  5 x = 2 y ⇒  x/2 = y/5 = k → coeficient de proportionalitate

⇒  x = 2 k si y = 5 k

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( 5 x + y ) / ( 3 x - y ) = 15

= ( 5 × 2k + 5 k ) / ( 3 × 2 k - 5 k ) =

= ( 10 k + 5 k ) / ( 6 k - 5 k ) =

= 15 k / k =

= 15 /1 =

= 15