Question

1、m²-9分之12减去m-3分之2

Answer 1

12/(m²-9)-2/(m-3)=12/(m+3)(m-3)-2(m+3)/(m+3)(m-3)=(12-2m-6)/(m+3)(m-3)=2(3-m)/(m+3)(m-3)=-2/(m+3) 1/(a-2)-1/(a+2)-5/(2-a)+4/(a+2)=6/(a-2)+3/(a+2)=(9a+6)/(a²-4）