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

Toán Lớp 8: Ptich các đt sau thành nhân tử e. x^2 -12x+36 f. 64x^3+27 g. x^2+6x+8 h.x^2+10x+16

Toán Lớp 8: Ptich các đt sau thành nhân tử
e. x^2 -12x+36
f. 64x^3+27
g. x^2+6x+8
h.x^2+10x+16

Comments ( 2 )

  1. e) x^2-12x+36
    =x^2-2.x.6+6^2
    =(x-6)^2
    f) 64x^3+27
    =(4x)^3+3^3
    =(4x+3)(16x^2-12x+9)
    g) x^2+6x+8
    =(x^2+2x)+(4x+8)
    =x(x+2)+4(x+2)
    =(x+2)(x+4)
    h) x^2+10x+16
    =(x^2+2x)+(8x+16)
    =x(x+2)+8(x+2)
    =(x+2)(x+8)

  2. e)
    x² – 12x + 36
    = x² – 2.x.6 + 6²
    = (x – 6)²
    f)
    64x³ + 27
    = (4x)³ + 3³ 
    = (4x + 3)[(4x)² – 4x.3 + 3²]
    = (4x + 3)(16x² – 12x + 9)
    g)
    x² + 6x + 8
    = x² + 2x + 4x + 8
    = x(x + 2) + 4(x + 2)
    = (x +4)(x + 2)
    h)
    x² + 10x + 16
    = x² + 2x + 8x + 16
    = x(x + 2) + 8(x + 2)
     = (x + 8)(x + 2)
     

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

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