5/16÷[(5/6一1/4)x11/7]=5/16÷(10/12一3/12)x11/7=5/16÷7/12x11/7=5/16x12/7x11/7=165/196
5/16÷[(5/6-1/4)ⅹ11/7]=5/16÷[(10/12-3/12)ⅹ11/7]=5/16÷[7/12ⅹ11/7]=5/16÷11/12=5/16X12/11=15/44