The U.S. dollar fell back from a 9 1/2-month high in Tokyo yesterday as traders took profits on recent sharp gains. The dollar was buoyed in Europe and New York by reports that President Carter will announce the decontrol of crude oil prices in his upcoming energy speech.

The price of gold also was lower as traders awaited outcome of the International Monetary Fund's montly gold auction. In Zurich, gold slipped 75 cents to $239.875 an ounce and in London it dropped $1.50 to $239.125. However, it recouped in New York to close at $241.75, compared with $239.30 Tuesday.

In Tokyo, the dollar closed unchanged at 214.40 yen after soaring to a 9 1/2-month high of 216.80 yen in early trading. In Frankfurt, the dollar rose to 1.882 marks from 1.881 Tuesday; and in Zurich, to 1.7054 Swiss francs from 1.7038. In London, the pound rose to $2.067 from $2.066. In Paris, the dollar eased to 4.322 francs from 4.3235; in Brussels, to 30.48 Belgian francs from 30.54; and in Milan, to 842.45 lire from 843.55. It was unchanged in Amsterdam at 2.028 guilders.