2x-1 8х³-1 2x-1 (4-3х)(4+3х) (4-3х)
-------- : ------------ = --------- * ------------------------ = ---------------------
3x+4 16-9х² 3x+4 (2х-1)(4х²+2х+1) (4х²+2х+1)
4-3х 4+1,5 5.5
------------------ при х=-0,5 -------------------------- = -------= 5.5
(4х²+2х+1) 4*0,25+2*(-0.5)+1 1