Giải giúp mik vs ạ, cảm ơn

`C = ( ( x + 5 )^2 + ( x - 5 )^2 )/( x^2 + 25 )`

`= ( x^2 + 10x + 25 + x^2 - 10x + 25 )/( x^2 + 25 )`

`= ( 2x^2 + 50 )/( x^2 + 25 )`

`= ( 2 ( x^2 + 25 ) )/( x^2 + 25 )`

`= 2`

Vậy `C = 2`

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`D = ( ( 2x + 5 )^2 + ( 5x - 2 )^2 )/( x^2 + 1 )`

`= ( 4x^2 + 20x + 25 + 25x^2 - 20x + 4 )/( x^2 + 1 )`

`= ( 29x^2 + 29 )/( x^2 + 1 )`

`= ( 29 ( x^2 + 1 ) )/( x^2 + 1 )`

`= 29`

Vậy `D = 29`