PORTLAND — Shoe and apparel company Nike Inc. said Thursday that it will cut about 1,750 jobs worldwide, or 5 percent of its global work force. About 500 of the jobs lost will be at Nike’s world headquarters in Beaverton. The company did not specify what departments the cuts would be in. Nike had announced in February that it would cut jobs as part of a realignment of its business. In March, it said it was reducing layers of management, among other organizational changes.