(5a-4b)^2-(5a-4b)(3a-2b) (2x-1)(2x+1)(4x^2-1)

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(5a-4b)^2-(5a-4b)(3a-2b) (2x-1)(2x+1)(4x^2-1)
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(5a-4b)^2-(5a-4b)(3a-2b) (2x-1)(2x+1)(4x^2-1)
(5a-4b)^2-(5a-4b)(3a-2b) (2x-1)(2x+1)(4x^2-1)

(5a-4b)^2-(5a-4b)(3a-2b) (2x-1)(2x+1)(4x^2-1)
(5a-4b)^2-(5a-4b)(3a-2b)=(5a-4b)[5a-4b-(3a-2b)]=(5a-4b)(2a-2b)=10a^2-18ab+8b^2
(2x-1)(2x+1)(4x^2-1)=(4x^2-1)(4x^2-1)=(4x^2-1)^2

  1.原式=(5a-4b)(5a-4b-3a+2b)
  =(5a-4b)(2a-2b)
  =10a²-18ab+8b²
  2.原式=(4x²-1)(4x²-1)
  =16x^4-8x²+1