=[(log6 2）²+㏒6 2×㏒6 18]÷㏒6 4=[log6 2(log6 2+㏒6 18)]÷㏒6 4=(log6 2×㏒6 36)÷㏒6 4=2log6 2÷㏒6 4=㏒6 4÷㏒6 4=1
