упростить выражение (2a/2a+b - 4a^2/4a^2+4ab+b^2) : (2a/4a^2-b^2 + 1/b-2a)
(1/x+1 - 3/x^3+1 + 3/x^2-x+1)(x - 2x-1/x+1)

1) 2а=(----- - 4а^2/(2а+б)^2)÷2а+б÷(2а/(2а-б)(2а+б) -1/(2а-б))=2а(2а+б)-4а^2=-------------------- ÷ (2а+б)^2 2а -1(2а+б)÷----------------=(2а-б)(2а+б)4а^2+2аб-4а^2=----------------- ÷(2а+б)^22а-2а-б÷-----------------=(2а-б)(2а+б)=2аб/(2а+б)^2 ÷(-б)/(2а-б)(2а+б)=2аб(2а-б)(2а+б)=---------------------= - 2а(2а-б)/(2а+б)(2а+б)^2×(-б)2)=(1/(х+1) -3/(х+1)(х^2-х+1) +3/(х^2-х+1))××(х- (2х-1)/(х+1))=х^2-х+1-3+3(х+1)=------------------------- ×(х+1)(х^2-х+1)х(х+1)-(2х-1)×---------------= х+1х^2-х-2+3х+3=------------------ ×(х+1)(х^2-х+1)х^2+х-2х+1×----------------= х+1х^2+2х+1=-------------------- ×(х+1)(х^2-х+1)х^2-х+1×--------------= х+1(х+1)^2 ×(х^2-х+1)=------------------------------=1(х+1)(х^2-х+1)×(х+1)