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

Toán Lớp 8: a^2 + 2a + 1 – b^2 3x^2 – 8x + 4

Toán Lớp 8: a^2 + 2a + 1 – b^2
3x^2 – 8x + 4

Comments ( 2 )

  1. a^2+2a+1-b^2
    =(a+1)^2-b^2
    =(a+1+b)(a+1-b)
    3x^2-8x+4
    =3x^2-2x-6x+4
    =x(3x-2)-2(3x-2)
    =(x-2)(3x-2)
     

  2. Giải đáp + Lời giải và giải thích chi tiết:
    $a^{2}+2a+1-b^2$
    $=(a^2+2a+1)-b^2$
    $=(a+1)^2-b^2$
    $=(a+1-b).(a+1+b)$
    $3x^2-8x+4$
    $=3x^2-2x-6x+4$
    $=x.(3x-2)-2.(3x-2)$
    $=(x-2).(3x-2)$
     

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

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