Question

a^2-4a+4分之a^2-1/a^-4分之a^-1

Answer 1

[(a²-1)/(a²-4a+4)]/[(a²-1)/(a²-4)]
=(a²-1)(a²-4)/(a²-4a+4)(a²-1)
=(a²-4)/(a²-4a+4)
=(a+2)(a-2)/(a-2)²
=(a+2)/(a-2)

如果不懂，请追问，祝学习愉快！

追问

a^2-4a+4分之a-1/a^-4分之a^-1

追答

[(a-1)/(a²-4a+4)]/[(a²-1)/(a²-4)]
=(a-1)(a²-4)/(a²-4a+4)(a²-1)
=(a-1)(a+2)(a-2)/(a-2)²(a+1)(a-1)
=(a+2)/(a-2)(a+1)