Răspuns:
a / ( x² + x - 6 )
Explicație pas cu pas:
b )
-------------------------------------------------------
a / ( a² - 4 ) : ( a + 3 ) / ( a + 2 ) =
= a / ( a - 2 )( a + 2 ) : ( a + 3 ) / ( a + 2 )
= a / ( a - 2 )( a + 2 ) · ( a + 2 ) / ( a + 3 )
= a / ( a - 2 ) · 1 / ( a + 3 )
= a / ( a - 2 )( a + 3 )
= a / ( x² + 3x - 2x - 6 )
= a / ( x² + x - 6 )