Question

exercițiul 5!!dau coroana!! ​

Answer 1

Răspuns:

Explicație pas cu pas:

5)

x/y = 0,(5)

0,(5) = 5/9

x/y = 5/9 =>  x = 5;  y = 9

( 6 x - y ) / 3 x = (6×5-9)/(3×5) = (30-9)/15 = 21/15 = 7/5

(21/15)⁽³ = (21:3)/(15:3) = 7/5

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sau:

x/y = 5/9 =>   9 x = 5 y =>  x/5 = y/9 = k → coeficient de proportionalitate

x = 5 k si y = 9 k

( 6 x - y ) /3 x = 7/5

= (6×5k - 9 k) /(3×5k) =

= (30k-9k)/15k =

= 21 k/15k =  k/k = 1

= 21/15 → simplific cu 3

= 7/5