81^3×27^4=(3^4)^3×(3^3)^4
=3^12×3^12
=(3×3)^12
=9^12
所以x=9
81^3×27^4=(3^4)^3×(3^3)^4
=3^12×3^12
=3^(12+12)
=3^24
所以y=3