题目

When will the two speakers probably discuss the project? A . On Tuesday. B . On Thursday. C . On Friday. 答案：C16．填空和计算：（1）给出下列代数式：$\frac{1}{2}$，$\frac{2x+1}{2x}$，$\frac{x+1}{2}$，x-5，$\frac{2}{{{x^2}-1}}$，$\frac{2-x}{x+2}$，其中有3个是分式；请你从上述代数式中取出一个分式为$\frac{2x+1}{2x}$，对于所取的分式：①当x≠0时分式有意义；②当x=2时，分式的值为$\frac{5}{4}$．（2）已知$x=\frac{{\sqrt{3}-\sqrt{2}}}{2}$，$y=\frac{{\sqrt{3}+\sqrt{2}}}{2}$，求代数式x2+6xy+y2的值．