(1) 75 100 = 3 4 =0.75=75%,(2) 58 100 = 29 50 =0.58=58%,(3) 55 100 = 11 20 =0.55=55%,故答案为:(1)0.75, 3 4 ,75%;(2)0.58, 29 50 ,58%;(3)0.55, 11 20 ,55%.