Question

x/y=2/7,aflati 5x/3y-5x

Answer 1

Răspuns

Explicație pas cu pas:

x / y = 2 / 7 ⇒  x = 2   si  y = 7

5 x / ( 3 y - 5 x ) = 10 / ( 21 - 10 ) = 10 / 11

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sau:  x / y = 2 / 7 ⇒  2 y = 7 x ⇒   y = 7 x / 2

5 x / ( 3 y - 5 x ) =  10 / 11

= 5 x / ( 3 × 7 x / 2 - 10 x / 2 ) =

= 5 x : 11 x / 2 =

= 5 x × 2 / 11 x =

= 10 / 11