2008 National Question 9 Single-choice Differentiating 2008_quanguo_old_ii 9.$(1-\sqrt{x})^4(1+\sqrt{x})^4$的展开式中$x$的系数是( ) A. -4B. -3C. 3D. 4 Answer keyA ☆ SaveCan't do it, show the explanation查看原卷 →