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

Toán Lớp 8: `a) 4x^2 – 9` `b) 16x^2 – 8x + 1` `c) 9x^2 + 6x + 1`

Toán Lớp 8: a) 4x^2 – 9
b) 16x^2 – 8x + 1
c) 9x^2 + 6x + 1

Comments ( 2 )

  1. Giải đáp + giải thích các bước giải :  $\\$ 
    a) 4x^2 – 9
    $\\$ =(2x)^2 – 3^2
    $\\$ = (2x-3)(2x+3)
    $\\$ b) 16x^2 – 8x + 1
    $\\$ = (4x)^2 – 2.4x.1 + 1
    $\\$ = (4x-1)^2
    $\\$ c) 9x^2 + 6x + 1
    $\\$ = (3x)^2 + 2.3x.1 + 1
    $\\$ = (3x+1)^2

  2. a) $4x^{2}$ – 9 
    = $(2x)^{2}$ – $3^{2}$ 
    = ( 2x – 3 ) ( 2x + 3 ) ( HĐT số 3
    b) $16x^{2}$ – 8x + 1 
    = $(4x)^{2}$ –  2.4x + $1^{2}$ 
    = $(4x-1)^{2}$ ( HĐT số 2 )
    c) $9x^{2}$ + 6x + 1
    = $(3x)^{2}$ + 2.3x + $1^{2}$ 
    = $(3x+1)^{2}$ ( HĐT số 1 )
    #ThePeach

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