Г) = (a+b)(a-b)(a²-ab+b²)(a²+ab+b²) / (a-3b)(a+3b)+(a-3b) * (a-3b) /
(a²+b²-ab)(a²+b²+ab) = (a+b)(a-b)(a²-ab+b²)(a²+ab+b²) / (a-3b)(a+3b+1) *
(a-3b) / (a²-ab+b²)(a²+ab+b²) = (a²-b²) / (a+3b+1)
д) = (2х(3у-2)-3(3у-2)) / (х-6)² : (3у-2)² / (3у(х-6)-2(х-6)) = (3у-2)(2х-3) /
(х-6)² * (х-6)(3у-2) / (3у-2)² = (2х-3) / (х-6)