Tokyo stocks opened mixed Thursday as bargain-hunting following three consecutive days of losses was offset by selling of technology issues tracking overnight declines by their U.S. counterparts. In the first 15 minutes of trading, the 225-issue Nikkei Stock Average fell 99.45 points, or 0.26 percent, from Wednesday to 38,596.52. The broader Topix index was up 1.73 points, or 0.07 percent, at 2,650.24. On the top-tier Prime Market, decliners were led by electric appliance and service issues, while top gainers were mining, and oil and coal product issues. At 9 a.m., the U.S. dollar fetched 147….