We had fun reading our bikes to the beach today中reading our bikes是在句中做什么的?

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• We had fun reading our bikes to the beach today中reading our bikes是在句中做什么的?
• We had fun reading our bikes to the beach today中reading our bikes是在句中做什么的?
• 高一数学、已知二次函数f(x)=ax^2+bx+4已知二次函数f(x)=ax^2+bx+4,集合A={x|f(x)=x}若A={1},求f(x).为什么【由A={1}得ax^2+(b-1)x+4=0有两等根为1】?我是说、为什么是【ax^2+(b-1)x+4=0】而不是【ax^2+bx+4=0】
• 二次函数f﹙x﹚满足f﹙x＋1﹚－f﹙x﹚＝2x,且f﹙0﹚＝1.求f﹙x﹚的解析式.在区间[－1,1]上,y=f(x)的象恒在y=2x+m的图像上方,是确定实数m的范围