a) xy=2^3 x 3 x 2^2x3x5=2^5 x 3^2 x 5=2x2^2 x 6^2 x 5=12^2 x 5=(12√10)^2
b) xy=3 x 5^2 x 3^2 x 5=15 x 15^2=(15√15)^2
c) xy=2 x 3 x 5 x 3^3 x 5=2 x 3^4 x 5^2=2 x 3^2 x 15^2=2 x 45^2 =(45√2)^2
d) xy=2^5x3x2^3x3x5=2^6 x 2^2 x 3^2 x 5=8^2 x 6^2 x 5 (48√5)^2