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

Toán Lớp 8: 1. 1/2xy.(x^3-2x-6) 2. -1.(x^3-2x-6) 3. x.(x^2+3x-5) 4. 3.(x^2,+3x-5)

Toán Lớp 8: 1. 1/2xy.(x^3-2x-6)
2. -1.(x^3-2x-6)
3. x.(x^2+3x-5)
4. 3.(x^2,+3x-5)

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    $\text{1) $\frac{1}{2}$xy .($x^{3}$ – 2x -6)}$
    $\text{= $\frac{1}{2}$$x^{4}$y – $x^{2}$y – 3xy }$
    $\text{2) -1.( $x^{3}$ – 2x – 6) }$
    $\text{= – $x^{3}$  + 2x + 6}$
    $\text{3) x.($x^{2}$ + 3x – 5)}$
    $\text{= $x^{3}$  + 3$x^{2}$ – 5x}$
    $\text{4) 3.( $x^{2}$ + 3x – 5)}$
    $\text{= 3$x^{2}$ + 9x – 15}$
    Học Tốt!
    $\text{#SunHee}$

  2. 1/ $\frac{1}{2}xy$ ($x^{3}$ – 2x -6)
    = $\frac{1}{2}$$x^{4}$y – $x^{2}$y – 3xy
    2/ -1 ($x^{3}$ – 2x – 6)
    = -$x^{3}$ + 2x + 6
    3/  x ($x^{2}$ + 3x – 5)
    = $x^{3}$ + 3$x^{2}$ – 5x
    4/  3 ($x^{2}$ + 3x – 5)
    = 3$x^{2}$ + 9x – 15

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