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

Toán Lớp 8: Làm tính chia : a. ( 8x^3 – 1 ) : ( 1 – 2x ) b. ( 27x^3 + 8 ) : ( 3x + 2 )

Toán Lớp 8: Làm tính chia :
a. ( 8x^3 – 1 ) : ( 1 – 2x )
b. ( 27x^3 + 8 ) : ( 3x + 2 )

Comments ( 1 )

  1. $a)8x^3-1$
    $=(2x)^3-1^3$
    $=(2x-1)(4x^2+2x+1)$
    $=-(1-2x)(4x^2+2x+1)$
    Chia cho 1-2x
    $=\dfrac{-(1-2x)(4x^2+2x+1)}{1-2x}$
    $=-(4x^2+2x+1)$
    $=-4x^2-2x-1$
    $b)27x^3+8$
    $=(3x)^3+2^3$
    $=(3x+2)(9x^2-6x+4)$
    Chia cho 3x+2
    $=\dfrac{(3x+2)(9x^2-6x+4)}{3x+2}$
    $=9x^2-6x+4$
    Chúc bạn học tốt !!!!!!!!
     

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