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

Toán Lớp 8: $16x^{2}$ – $8x^{}$ + 1 -$16y^{2}$

Toán Lớp 8: $16x^{2}$ – $8x^{}$ + 1 -$16y^{2}$

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     16x^2 – 8x + 1 – 16y^2
    =(16x^2 – 8x +1) – 16y^2
    =(4x -1)^2 – (4y)^2
    =[(4x-1)-4y].[(4x-1)+4y]
    =(4x-1-4y).(4x-1+4y)

  2.     16x² – 8x + 1 – 16y²
    = ( 16x² – 8x + 1 ) – 16y²
    = [ ( 4x )² – 2 . 4x + 1 ] – ( 4y )²
    = ( 4x – 1 )² – ( 4y )²
    = ( 4x – 1 – 4y ) ( 4x – 1 + 4y )
    = ( 4x – 4y – 1 ) ( 4x + 4y – 1 )

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

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