Question

16-a^2/a^2+8a+16÷a-4/2a+8×a-2/a+2

Answer 1

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

=(4+a)(4-a)/(a+4)^2×(2a+8)/(a-4)×(a-2)/(a+2)

=(4-a)/(a+4)×2(a+4)/(a-4)×(a-2)/(a+2)

=-2×(a-2)/(a+2)

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