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

Toán Lớp 8: (X-Y)^2-(Z-T)^2 phân tích đa thức

Toán Lớp 8: (X-Y)^2-(Z-T)^2
phân tích đa thức

Comments ( 2 )

  1. ( x – y)^{2} – ( z – t)^{2}
    = [( x – y) – ( z – t)][( x – y) + ( z – t)]
    = ( x – y – z + t)( x – y + z – t)
     

  2. (x-y)^2-(z-t)^2
    =x^2-2xy+y^2-z^2+2zt-t^2
    CT: (x-y)^2=x^2-2xy+y^2
     

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