题目

It was years ago. He was young. I saw him as he _______ (36) the busy crossroads near a mall in northwest Austin. He walked with one arm moving wildly, _______ (37) a leg, as he went. I had seen the walk before at the hospital. He caught my ______ (38) because I had known a young man who had ______(39) through the ordeal (磨难) just a few years before and walked with a _____ (40) walk. The reason why I stopped to watch was that I didn't think he would _____（41） it across the busy 7 lanes of _____ (42) during the time allowed by the light. But as the light turned _____ (43) and the crossw 已知椭圆＋＝1(a1>b1>0)与双曲线－＝1(a2>0，b2>0)有公共焦点F1、F2，设P是它们的一个交点． (1)试用b1，b2表示△F1PF2的面积； (2)当b1＋b2＝m(m>0)是常数时，求△F1PF2的面积的最大值．