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

Toán Lớp 8: Tính nhanh: ($5x^{3}$ + $14x^{2}$ + 12x + 8) : (x + 2)

Toán Lớp 8: Tính nhanh: ($5x^{3}$ + $14x^{2}$ + 12x + 8) : (x + 2)

Comments ( 2 )

  1. Answer
    $\begin{array}{c|c}\qquad \quad 5x^3 + 14x^2 + 12x + 8&x + 2\\\hline 5x^3 + 10x^2&5x^2 + 4x + 4\\\text{______________________}\\4x^2 + 12x + 8\\4x^2 + 8x\\\text{______________________}\\4x + 8\\4x + 8\\\text{______________________}\\0\end{array}$
    $\text{Vậy}$ (5x^3 + 14x^2 + 12x + 8) : (x + 2) = 5x^2 + 4x + 4

  2. Giải đáp+Lời giải và giải thích chi tiết:
    (5x³+14x²+12x+8):(x+2)
    =(5x³+10x²+4x²+8x+4x+8)/(x+2)
    =(5x²(x+2)+4x(x+2)+4(x+2))/(x+2)
    =((x+2)(5x²+4x+4)
    )/(x+2)
    =5x²+4x+4
     

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

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