1/2 lg32/49-4/3lg根号下8+lg根号下245
=(1/2)*lg49-(1/2)*lg32-(4/3)*lg2^(3/2)+(1/2)*lg(5*49)
=lg7-(5/2)lg2-2lg2+(1/2)lg5+lg7
=2lg7-5lg2+1/2
居然化不了整!