Question

Daca x/y = 2/3 , atunci 3x-y/x+y este egal cu ???

Answer 1

X=2 Y=3
3×2-3/2+3=
6-3/2+3=
3/5

Answer 2

Răspuns

Explicație pas cu pas:

x / y = 2 / 3 ⇒   x = 2  si  y = 3

( 3 × 2 - 3 ) / ( 2 + 3 ) =  ( 6 - 3 ) / 5 = 3 / 5

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sau:

x / y = 2 / 3 ⇒  3 x = 2 y ⇒  x = 2 y / 3

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

= ( 3 × 2 y / 3 - y ) / ( 2 y / 3 + y ) =

= ( 2 y - y ) / ( 2 y / 3 + 3 y / 3 ) =

= y / ( 5 y / 3 ) =

= y × 3 / 5 y =

= 3 / 5