Question

Daca x/y=4/9 y nenul,atunci 4x+6y/x+y

Answer 1

Răspuns:

Explicație pas cu pas:

x/y = 4/9 =>  9 x = 4 y

=>   x/4 = y/9 = k → coeficient de proportionalitate

x = 4 k   si   y = 9 k

_______________

( 4 x + 6 y ) / ( x + y ) = 70/13

= ( 4 ×4k + 6×9k)/(4k+9k) =

= (16k + 54k)/13k=

= 70k/13k =

= 70/13