Question

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₴₴₴₴₴₴₴₴₴₴₴₴₴

Answer 1

3.

$dfrac{m^2}{m^2-9}-dfrac{m}{m+3}=dfrac{m^2}{(m+3)(m-3)}-dfrac{m}{m+3}=\\ \ =dfrac{m^2}{(m+3)(m-3)}-dfrac{m(m-3)}{(m+3)(m-3)}=\ \\ =dfrac{m^2-m(m-3)}{(m+3)(m-3)}=dfrac{m^2-m^2+3m}{m^2-9}=dfrac{3m}{m^2-9}$

4.

$dfrac{14p^2}{7p+3}-dfrac{2p}{1}=dfrac{14p^2}{7p+3}-dfrac{2p*(7p+3)}{7p+3}=\ \ \ =dfrac{14p^2-2p(7p+3)}{7p+3}=dfrac{14p^2-14p^2-6p}{7p+3}=\ \ \ =-dfrac{6p}{7p+3}$