1) 1/9a^2+1/3ab+1/4b^2
=1/36×(4a^2+12ab+9b^2
=1/36(2a+3b)^2
2)1/8a^3b-1/8a^2b^2+1/32ab^3
=1/32ab×(4a^2-4ab+b^2)
=1/32ab(2a-b)^2
1) 1/9a^2+1/3ab+1/4b^2
=1/36×(4a^2+12ab+9b^2
=1/36(2a+3b)^2
2)1/8a^3b-1/8a^2b^2+1/32ab^3
=1/32ab×(4a^2-4ab+b^2)
=1/32ab(2a-b)^2