Question

计算a²+8a+16分之16-a²÷2a+8分之a-4×a+2分之a-2

Answer 1

(16 - a²)/(a²+8a+16) ÷ (a-4)/(2a+8) × (a-2)/(a+2)

= (4+a)(4-a) / (a+4)² × 2(a+4)/(a-4) ×(a-2)/(a+2)

= - 2(a-2)/(a+2)