Tokyo stocks fell Monday morning, as exporters were pressured by the yen’s strength after the U.S. Federal Reserve chief signaled late last week that interest rate cuts are due for the world’s largest economy. The 225-issue Nikkei Stock Average fell 419.59 points, or 1.09 percent, from Friday to 37,944.68. The broader Topix index was down 30.39 points, or 1.13 percent, at 2,654.33. The U.S. dollar weakened in Tokyo to briefly trade in the mid-143 yen range, its lowest level in three weeks, after Fed Chief Jerome Powell’s speech on Friday raised expectations that rate cuts will begin in Septemb…