=[(a+b)^2(a-b)^2*b^3/[ab*a^3*(a+b)^3*(a-b)^3]
=b^2/[a^4(a+b)(a-b)]
=b^2/[a^4(a^2-b^2)]
5) Original formula = [(x-y) 2/(x+y) 2] * (x+y) 4/(x-y) 2.
=(x+y)^2
3) Original formula = [25/36 * y2/X6] * [(-27/125 * x12/y6].
=-(25/36*27/ 125)*[y^2/x^6*x^ 12/y^6]
=-3/20*x^6/y4
=-(3x^6)/(20y^4)
simplify
Original formula = [(x-y) (x-y+x+y)]/2x = [(x-y) 2x]/2x = x-y.
The original formula = x-y = 2015-2016 =-1.
3) Original formula = [2+3 (x-y)] 2 = (3x-3y+2) 2.