1) х+2 / х-1 = (х+2)(х-2) / (х-1)(х-2) = х²-4 / (х-1)(х-2)
х+1 / х-2 = (х+1)(х-1) / (х-2)(х-1) = х²-1 / (х-1)(х-2)
2) х-3 / х+3 = (х-3)(х-3) / (х+3)(х-3) = х²-6х+9 / х²-9
х / х-3 = х(х+3) / (х-3)(х+3) = х²+3х / х²-9
3) 3-х / х-5 = -(х-3)(х-3) / (х-5)(х-3) = -х²+6х-9 / (х-5)(х-3)
х / х-3 = х(х-5) / (х-3)(х-5) = х²-5х / (х-5)(х-3)
4) х+1 / х²-2х = х+1 / х(х-2) = (х+1)(х+2) / х(х-2)(х+2) = х²+3х+2 / х(х-2)(х+2)
4+х / х²-4 = 4+х / (х-2)(х+2) = х(4+х) / х(х-2)(х+2) = 4х+х² / х(х-2)(х+2)