Упростить .........

Question

Упростить
.........

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Answer 1

1) m/(m^2-9) * (m+3)/m=1/(m - 3)
2) (5m - 21)/((m^2-9) + 1/(m - 3)=(5m - 21 +m+3)/(m^2 - 9)=(6m - 18)/(m^2 - 9)= 6*(m - 3)/(m -3)*(m +3)=6/(m+3)
3)6/(m+3)+(m - 3)/(m +3)=(6+m - 3)/(m +3)=(m+3)/(m+3)= 1