30 . (8х+1/2y)^2 (0,4a-5b)^2 (b^2-3)^2 (2x^4+5x^3b^5)^2

(8х+1/2y)^2= 64х^2+8ху+1/4у^2= 256х^2+32ху+у^2

(0,4a-5b)^2= 0.16а^2-4аб+ 25б^2= 0.04а^2-аб+6.25б^2

(b^2-3)^2= б^4-6б^2+9

(2x^4+5x^3b^5)^2= 4х^8 + 20х^7б^5 + 25х^6б^10= х^8 + 5х^7б^5 + 6.25х^6б^10