分数计算,(a²-6a+9)/(a²-3a)÷(a²-9)/(a-3)

问题描述:

分数计算,(a&sup2-6a+9)/(a&sup2-3a)÷(a&sup2-9)/(a-3)

(a²-6a+9)/(a²-3a)÷(a²-9)/(a-3)
=(a-3)² / a(a-3) ÷ (a+3)(a-3)/(a-3)
=(a-3)/a ÷ (a+3)
=(a-3)/[a(a+3)]
=(a-3)/(a^2+3a)