题目

Open an app, place your order, and wait for your food to be delivered (递送) to your home this is how many people eat in China these days. According to the latest data(数据)from the China Internet Network Information Center, 421 million Chinese people use online food delivery services. That’s to say half of the total number of Internet users in China. Which group of people is ordering food online the most? Unsurprisingly, it，s mainly young people. A recent report that was jointly published by the China Hospitality Association and Meituan, a food delivery service, showed that 86. 3 perc定义一种新运算“”如下：当时，;当时，,对于函数（“· ”和“”仍为通常的乘法和减法运算）,把  的图像按向量平移后得到的图像，若是奇函数，则____________．