Question

y-x/x²-y² a+2/a²-2a-a+4/a²-4 5/12a²

Answer 1

(y-x)/(x²-y²)=-(x-y)/[(x-y)(x+y)]=-1/(x+y)

.

(a+2)/(a²-2a) - (a+4)/(a²-4)

=(a+2)/[a(a-2)] - (a+4)/[(a+2)(a-2)]

=[(a+2)²-a(a+4)]/[a(a+2)(a-2)]

=(a²+4a+4- a²-4a)/[a(a+2)(a-2)]

=4/[a(a+2)(a-2)]

.

5/12a²-3/8ab

=(1/24)a*(10a - 9b)