Question

1-(a+2b分之a-b)÷(a²+4ab+4b²分之a²-b²)紧急的嗷嗷!

Answer 1

1-[(a-b)/(a+2b)]*[(a+2b)^2/(a+b)(a-b)]=1-(a+2b)/(a+b)=1-[1+b/(a+b)]=-b/(a+b)