题目 Problem Find the term independent of xxx in the expansion of each of the following: (a) (x+3x2)6\left(x+\dfrac{3}{x^2}\right)^6(x+x23)6 [2] (b) (4x3−5)(x+3x2)6(4x^3-5)\left(x+\dfrac{3}{x^2}\right)^6(4x3−5)(x+x23)6. [4] 题目中文翻译 求下列各式展开式中与 xxx 无关的项： (a) (x+3x2)6\left(x+\dfrac{3}{x^2}\right)^6(x+x23)6 (b) (4x3−5)(x+3x2)6(4x^3-5)\left(x+\dfrac{3}{x^2}\right)^6(4x3−5)(x+x23)6。 解答
