Question

daca x supra y=2 supra 5,atunci aflati valoarea rapoartelor :
a)3x supra 4y
b)3x+2y supra 3y
c)2x+3y supra 7x-2y​

Answer 1

Răspuns:

Sper ca l-am facut bine :)

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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a)   3x/4y = ( 3×2k)/(4×5k)= 6k/20k = (6/20)⁽² = 3/10

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b)

(3x+2y)/3y = 16/15

= (3×2k + 2×5k) / (3×5k) =

= ( 6 k + 10 k ) /15k =

= 16k/15 k =

= 16/15

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c)

(2 x + 3 y ) / ( 7 x - 2 y ) = 19/4

= ( 2×2k + 3×5k) /( 7×2k - 2×5k ) =

= ( 4 k + 15 k ) / ( 14 k - 10 k ) =

= 19 k / 4 k =

= 19/4