Question

(m四次方-18m²+81)/)/(m²-6m+9)计算

Answer 1

(m四次方-18m²+81)/)/(m²-6m+9)

=(m^2-9)^2/(m-3)^2

=(m-3)^2(m+3)^2/(m-3)^2

=(m+3)^2

=m^2+6m+9