(4u-12v+9v²/u):(2-3v/u)=(4u-3v(4-3v/u)):(2-3v/u)=4u:(2u-3v/u) - 6v:(2u-3v/u) -
-3v(2u-3v/u):(2u-3v/u)=4u²:(2u-3v)-6uv:(2u-3v)-3v=(4u²-6uv-3v(2u-3v)):(2u-3v)=
=(4u²-12uv+9v²):(2u-3v)=(2u-3v)²:(2u-3v)=2u-3v
при u=1+3√7
v=2+2√7
2u-3v=2(1+3√7)-3(2+2√7)=2+6√7-6-6√7=2-6= -4