3^x=2,12^y=8
x=log3(2),y=log12(8)
1/x-3/扰孝答y
=1/log3(2)-3/log12(8)
=log2(3)-3log8(12)
=log2(3)-3log2(12)/log2(8)
=log2(3)-3log2(12)/3
=log2(3/缓慧12)
=log2(1/慎纳4)
=-2
x=log3 (2)
y=log12(仿渗洞8)=3log12(喊乎2)
(1/x)-(备枯3/y)=log2(3)-log2(12)
=-2
2^(1/x)=3
8^(1/y)=12,基笑因此肆察2^(3/y)=12
1/x=log2 3
3/裂锋茄y=log2 12
1/x-3/y=log2 3-log2 12=log2 (3/12)=log2 (1/4)=log2 1-log2 4=0-2=-2