25/144n^3-5又44/49n=________________________ (a+b)^2-8(a+b)(a-b)+16(a-b)^2=___________________________

25/144n^3-5又44/49n=________________________ (a+b)^2-8(a+b)(a-b)+16(a-b)^2=___________________________


1.(25/144)n(n-204/35)(n+204/35)
2.(3a-5b)^2