(2y/3x-3x/2y):(2y+3x) при x=1/3, y=1/4
((2*1/4)/3*1/3)-((3*1/3)/(2*1/4)):(2*1/4+3*1/3)= (1/2-2):(1/2+1)= -1,5:1,5=-1