Toán 8- Phân tích đa thức thành nhân tử help

B

braga

[TEX]a, \ 3x^2+6xy+3y^2-3z^2=3(x^2+2xy+y^2-z^2)=3[(x+y)^2-z^2]=3(x+y+z)(x+y-z)[/TEX]

[TEX]b, \ x^2-2xy+y^2-z^2+2zt-t^2=(x-y)^2-(z-t)^2=(x-y-z+t)(x-y+z-t)[/TEX]
 
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