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

Toán Lớp 8: d) (x3 + 5×2 – 2x + 1)(x – 7) =

Toán Lớp 8: d) (x3 + 5×2 – 2x + 1)(x – 7) =

Comments ( 2 )

  1. Giải đáp:
    $d) (x³+5x²-2x+1)(x-7)$
    $=x³.x+x³.(-7)+5x².x+5x².(-7)+(-2x).x+(-2x).(-7)+1.x+1.(-7)$
    $=x^4-7x³+5x³-35x²-2x²+14x+x-7$
    $=x^4-2x³-37x²+15x-7$ 
            Chúc bn hc tốt????
                    $\text{#LinhSad}$
     

  2. Giải đáp:
    $\begin{array}{l}(x^3+5x^2-2x+1)(x-7)\\=x^4-7x^3+5x^3-35x^2-2x^2+14x+x-7\\=x^4-2x^3-37x^2+15x-7\end{array}$

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

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