因式分解 (1)16m^3n^2-9mn^3 (2)4(x-y)^3-8x(x-y)^2 (3)10a(x-y)^2-5b(y-x)(4)-4(x-2y)^2+9(x+y)^2(5)(x^2-4x)^2+8(x^2-4x)+16

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