（1）已知x=27，y=64，化简并计算：5x-23y12(-14x-1y12)•(-56x13y16)；（2）计算：2log32-log3329+log38-25log53．

Question

（1）已知x=27，y=64，化简并计算：(5x-(2)/(3)y(1)/(2))/((-(1)/(4)x-1y(1)/(2))•(-(5)/(6)x(1)/(3)y(1)/(6)))；
（2）计算：2log₃2-log₃(32)/(9)+log38-25log53．

Answer 1

（1）已知x=27，y=64，
(5x-(2)/(3)y(1)/(2))/((-(1)/(4)x-1y(1)/(2))•(-(5)/(6)x(1)/(3)y(1)/(6)))=24x-(2)/(3)+1-(1)/(3)•y(1)/(2)-(1)/(2)-(1)/(6)=24×64-(1)/(6)=12．
（2）2log₃2-log₃(32)/(9)+log38-25log53=2log₃2-5log₃2+2+3log₃2-9
=-7．