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

Toán Lớp 8: 2x(x^2-7x-3) (-5x^3). (2x^2+3x-5)

Toán Lớp 8: 2x(x^2-7x-3)
(-5x^3). (2x^2+3x-5)

Comments ( 2 )

  1. $\text {a,}$
    2x(x^2-7x-3)
    = 2x^3-14x^2-6x
    $\text {b,}$
    -5x^3(2x^2+3x-5)
    = -10x^5-15x^4+25x^3
    $\text {@lamtung2007}$
     

  2. $1.)2x.$$(x^{2}-7x-3)$ 
    $=$ $2x^{3}-$ $14x^{2}-6x$ 
    $2)(-5x^{3}).$ $(2x^{2}+3x-5)$ 
    $=-10x^{5}-$ $15x^{4}+$ $25x^{3}$
    Giai bằng cách nhân phân phối 
    $chucbanhoktot$
    $xinhaynhat$
    $Sói$
     

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