1, (1+2x)(2x-1) 2, (4y^2+4xy+4x^2)(2x-2y)

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1. `1, (1+2x)(2x-1)`
   `= (2x+1).(2x-1)`
   `= (2x)^2 -1^2`
   `= 4x^2 -1`

   `2, (4y^2+4xy+4x^2)(2x-2y)`
   ` = 4.(y^2 + 2xy+x^2).2.(x-y)`
   `= 2^2.(x+y)^2 . 2.(x-y)`
   `=2.(2x+2y)^2.(x-y)`

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2. Đáp án:

   `1,(2x+1)(2x-1)=(2x)^2-1^2=4x^2-1`

   `2,(4x^2+4xy+4y^2)(2x-2y)`

   `=[4(x^2+xy+y^2)].[2(x-y)]`

   `=[4(x+y)^2].[2(x-y)]`

   `=[2.(x+y)]^2 .[2(x-y)]`

   `=2.(2x+2y)^2 . (x-y)`

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