4 3/4 : 1/4 - 2 3/14 × 7
1)4 3/4 :1/4=19/4 * 4/1= 19 2) 2 3/14 *7/1 = 31/2 3)19/1-31/2 = 38/2-31/2= 7/2=3 1/2
19/4×4/1-31/14×7=19-31/2=19-15,5=3,5