Podaj dziedzinę i wykonaj działania:
A)
b)
Bardzo proszę o szybką odpowiedz!!
a)
[ ( x + 3)^2 / ( x^2 - 9) ] * x =
x^2 - 9 = (x -3)*(x + 3) , zatem mianownik równa się 0 dla x = 3 lub x = - 3
D = R \ { -3. 3 }
==============
[ (x + 3)^2 / ( (x -3)*(x + 3))]*x = [(x + 3)* x]/( x -3) = ( x^2 + 3 x)/( x - 3)
15/(2x) + (2x - 11)/( 16 x^2)
D = R \ { 0 }
=============
15/ (2x) + ( 2x - 11)/(16 x^2) = (15* 8 x)/(16 x^2) + ( 2x - 11)/(16 x^2) =
= (120 x)/( 16 x^2) + (2x - 11)/( 16 x^2) = (122x - 11)/(16 x^2)
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a)
[ ( x + 3)^2 / ( x^2 - 9) ] * x =
x^2 - 9 = (x -3)*(x + 3) , zatem mianownik równa się 0 dla x = 3 lub x = - 3
D = R \ { -3. 3 }
==============
[ (x + 3)^2 / ( (x -3)*(x + 3))]*x = [(x + 3)* x]/( x -3) = ( x^2 + 3 x)/( x - 3)
b)
15/(2x) + (2x - 11)/( 16 x^2)
D = R \ { 0 }
=============
15/ (2x) + ( 2x - 11)/(16 x^2) = (15* 8 x)/(16 x^2) + ( 2x - 11)/(16 x^2) =
= (120 x)/( 16 x^2) + (2x - 11)/( 16 x^2) = (122x - 11)/(16 x^2)