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

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

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

(a+b)^2-8(a+b)(a-b)+16(a-b)^2=9(a+b)^2