题目

Music is magic! Music speaks louder than words and it is a “language” that the whole world can understand. A piece of music can produce a response in the heart and mind. Like feeling an electrical current or receiving a personal radio signal, music has a spiritual effect on a person. Different kinds of music influence people in different ways.  I have listened to music all my life. When I was twelve years old, the Beatles came to America and my whole world opened up. Maybe young people today cannot understand the influence of the Beatles when they exploded across America. Their in已知一个反比例函数的图象经过点． （Ⅰ）求这个函数的解析式； （Ⅱ）判断点是否在这个函数的图象上； （Ⅲ）当时，求自变量的值．