Cho hàm số 

Câu hỏi: Cho hàm số $f\left(x\right)=\frac{x^2}{-x+1}.$ Tính $f^{\left(30\right)}\left(x\right):$

A. $f^{\left(30\right)}\left(x\right)=30!{\left(1-x\right)}^{-30}.$

B. $f^{\left(30\right)}\left(x\right)=30!{\left(1-x\right)}^{-31}.$

C. $f^{\left(30\right)}\left(x\right)=-30!{\left(1-x\right)}^{-30}.$

D. $f^{\left(30\right)}\left(x\right)=-30!{\left(1-x\right)}^{-31}.$