X y 6 xy 12 July 8, 2019 16 32 64 128 X 2y 6 x 2 xy 12 y 2 Xy 12 x y 2 )= 6 X y z 6 xy yz zx 12 X 6 y 12 và xy 648 If x y 12 and xy 6 find the value of x2 y2 X y 6 xy 12 2x 3 y 3 Xy 6