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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Khai triển : (2x+1) ² (2x-1) ² (5x-1)(5x+1)

Toán Lớp 8: Khai triển :
(2x+1) ²
(2x-1) ²
(5x-1)(5x+1)

Comments ( 2 )

  1. (2x+1)^2
    =(2x)^2+2.2x+1
    =4x^2+4x+1
    b,
    (2x-1)^2
    =(2x)^2-2.2x+1
    =4x^2-4x+1
    c,
    (5x-1)(5x+1)
    =(5x)^2-1
    =25x^2-1
     

  2. a) (2x+1)^2
    =(2x)^2+2.2x.1+1^2
    =4x^2+4x+1
    b) (2x-1)^2
    =(2x)^2-2.2x.1+1^2
    =4x^2-4x+1
    c) (5x-1)(5x+1)
    =(5x)^2-1^2
    =25x^2-1

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222-9+11+12:2*14+14 = ? ( )

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