[math][(-ab^2)^2+1/3a^2b^4]:(ab^2)^2-(1/2a^2b)^2:[(3/4ab)^2(-a)^2][/math]
[math][a^2b^4+1/3a^2b^4]:(a^2b^4)-(1/4a^4b^2):[9/16a^4b^2][/math]
[math][4/3a^2b^4]:(a^2b^4)-4/9[/math]
[math]4/3-4/9[/math]
[math]8/9[/math]
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