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

Toán Lớp 8: x^3+2x^2+x-25xy^2 giúp tôi vs!!

Toán Lớp 8: x^3+2x^2+x-25xy^2 giúp tôi vs!!

Comments ( 2 )

  1.  $x^3+2x^2+x-25xy^{2}$ 
    $=(x^3+2x^2+x)-25xy^{2}$ 
    $=x(x^2+2x+1)- 25xy^{2}$ 
    $=x(x+1)^2 – x(5y)^{2}$ 
    $=x[(x+1)^2 – (5y)^2]^{}$ 
    $=x(x+1-5y)(x+1+5y)^{}$ 
     

  2. $= x(x^2 + 2x +1-25y^2)$
    $= x[(x+1)^2-25y^2]$
    $= x(x+1-5y)(x+1+5y)$

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

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