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.Descopunerea in factori:
a). xy² plus x²y - x²y²-3x²y
b)9x² plus 12xy plus 4y²


Răspuns :

a). xy² + x²y - x²y²-3x²y=xy(y+x-xy-3x)=xy(y-2x-xy)


b)9x² + 12xy + 4y²
=(3x+4y)²