Răspuns:
Explicație pas cu pas:
[tex]\bf a)~~\dfrac{a^{2} +a}{7a+7} =\dfrac{a\cdot\not(a +1)}{7\cdot\not(a+1)} =\purple{\dfrac{a}{7} }[/tex]
[tex]\bf b)~~\dfrac{-3m+6}{m^{2}-4m+4} =\dfrac{-3\cdot\not(m-2)}{(m-2)^{\not2}} =\blue{\dfrac{-3}{m-2} }[/tex]
