题目

阅读理解 Standing desks have become common across Silicon Valley, offering health benefits to those willing to work on their feet. However, due to their high price, they have failed to catch on until now. Recently, Ikea has brought out Bekant convertible（可变换的） standing desk that can become a normal desk at the touch of a button. The $500 adjustable desk can transform from a standard desk to a standing one, and Ikea hopes it could make the standing desk mainstream. Experts say that changing from a seated to a standing desk can improve productivity. Similar desks have become a co 解答题：解答应写出文字说明，证明过程或演算步骤． 设函数 (1) 若f(x)的周期为π，求当时，f(x)的值域 (2) 若函数f(x)的图象的一条对称轴方程为，求的值