1)
{х^2-y^2} / н^2x : {x-y}/yx = {x^2-y^2} * yх / (х-y) = {(х-y)(x+y)}/y^2x * yx/(х-y) = (x+y)/y
2) {2(m+1)+m}/(m+1) * (3m^2+3m)/(12m+8) = (2m+2+m)/(m+1) *{3m(m+1)} /{4(3m+2)} = (3m+2)/(m+1) * {3m(m+1)}/{4(3m+2)} = 3m/4
3) (4+b)/(4-b) * (2b^2-4b-b^2)/(4+b) = (b^2-4b)/(4-b) = {b(b-4)}/(4-b) = -b
4) {y-2y(y-5)}/(y-5) * (y-5)/(11-2y) = (y-2y^2+10y)/(11-2y) = (11y-2y^2)/(11-2y) = {y(11-2y)}/(11-2y) = y
5) (a+8b)/2b - 3a^2b/b^2*6a = (a+8b)/2b - a/2b = (a+8b-a)/2b = 4