451
(2y/3x-3x/2y): (2y+3x) = (4y² - 9x²)/6xy * 1/(2y+3x) = (2y-3x)(2x+3y)/6xy * 1/(2y+3x) = (2y-3x)/6xy
x=1/3 y=1/4 (2*1/4 - 3*1/3)/(6*1/3*1/4) = (1/2 - 1) / 1/2 = (-1/2)*2= - 1
452
(u + 2v + v²/u) : (1 + v/u) = (u²+2uv+v²)/u : (u+v)/u = (u+v)²/u * u/(u+v) = u+v
u=7+√5 v=7-√5
u+v=7+√5+7-√5=14