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

Toán Lớp 9: Giải pt : $x^4+10x^3+21x^2-20x-12$

Toán Lớp 9: Giải pt : $x^4+10x^3+21x^2-20x-12$

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
      x^4+10x^3+21^220x12
    =x^4 – x^3 + 11x^3 – 11x^2 + 32x^2 – 32x +12x – 12
    =( x^4 – x^3 ) + ( 11x^3 – 11x^2 ) +( 32x^2 – 32x ) + ( 12x – 12 )
    =x^3 .( x-1 ) + 11x^2 .( x-1 ) + 32x .( x-1 ) + 12 .( x-1 )
    = ( x-1 ) .( x^3 + 11x^2 + 32x +12 )

  2. $x^4+10x^3+21x^2-20x-12$
    $=x^4-x^3+11x^3-11x^2+32x^2-32x+12x-12$
    $=x^3(x-1)+11x^2(x-1)+32x(x-1)+12(x-1)$
    $=(x-1)(x^3+11x^2+32x+12)$
    $=(x-1)(x^3+6x^2+5x^2+30x+2x+12)$
    $=(x-1)[x^2(x+6)+5x(x+6)+2(x+6)]$
    $=(x-1)(x+6)(x^2+5x+2)$
    Chúc bạn học tốt !!!!!!

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