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a )
\(x^2y+x^2+xy+xy^2+xy+y^2\)
\(=\left(x^2y+xy^2\right)+\left(x^2+2xy+y^2\right)\)
\(=xy\left(x+y\right)+\left(x+y\right)^2\)
\(=\left(x+y\right)\left(xy+1\right)\)
b )
\(x^2+xy+x+xy+y+y^2\)
\(=\left(x^2+2xy+y^2\right)+\left(x+y\right)\)
\(=\left(x+y\right)^2+\left(x+y\right)\)
\(=\left(x+y\right)\left(x+y+1\right)\)
c )
\(x^2+y^2+z^2+2z\left(x+y\right)+2xy\)
\(=\left(x^2+2xy+y^2\right)+z^2+2z\left(x+y\right)\)
\(=\left(x+y\right)^2+z^2+2z\left(x+y\right)\)
\(=\left(x+y\right)\left(x+y+2z\right)+z^2\)
Phân tích đa thức thành nhân tử ( phối hợp các phương pháp )
1) x2 - ( a + b )xy + aby2
\(=x^2-axy-bxy+aby^2\)
\(=(x^2-axy)-(bxy+aby^2)\)
\(=x(x-ay)-by(x+ay)\)
\(=(x-ay)(x-by)\)
2) x2 + ( 2a + b )xy + 2aby2
=x2 + 2axy + bxy + 2aby2
=(x2+ bxy) +(2axy+ 2aby2 )
=x(x+ by) +2ay(x+ by)
=(x+ by)(x+2ay)
Sửa đề
\(2A=2x^2+2y^2+2xy-2x+2y+2\)
\(=\left(x^2+2xy+y^2\right)+\left(x^2-2x+1\right)+\left(y^2+2y+1\right)\)
\(=\left(x+y\right)^2+\left(x-1\right)^2+\left(y+1\right)^2\ge0\)
\(\Rightarrow A_{min}=0\Leftrightarrow\left\{{}\begin{matrix}x=1\\y=-1\end{matrix}\right.\)
a, x2 + (a +b) xy + aby2
=\(x\left(x+ay\right)+by\left(x+ay\right)\)
=\(\left(x+ay\right)\left(x+by\right)\)
a) \(x^2+\left(a+b\right)xy+aby^2\)
\(=x^2+axy+bxy+aby^2\)
\(=x\left(x+ay\right)+by\left(x+ay\right)\)
\(=\left(x+ay\right)\left(x+by\right)\)
b) \(a^2-\left(c+d\right)ab+cdb^2\)
\(=a^2-abc-abd+cdb^2\)
\(=a\left(a-bc\right)-bd\left(a-bc\right)\)
\(=\left(a-bc\right)\left(a-bd\right)\)
c) Sửa đề: \(ab\left(x^2+y^2\right)+xy\left(a^2+b^2\right)\)
\(=abx^2+aby^2+a^2xy+b^2xy\)
\(=abx^2+b^2xy+a^2xy+aby^2\)
\(=bx\left(ax+by\right)+ay\left(ax+by\right)\)
\(=\left(ax+by\right)\left(bx+ay\right)\)
d) Sửa đề: \(\left(xy+ab\right)^2+\left(ay-bx\right)^2\)
\(=x^2y^2+2abxy+a^2b^2+a^2y^2-2abxy+b^2x^2\)
\(=x^2y^2+a^2y^2+a^2b^2+b^2x^2\)
\(=y^2\left(x^2+a^2\right)+b^2\left(x^2+a^2\right)\)
\(=\left(x^2+a^2\right)\left(y^2+b^2\right)\)
=22+2.xy.2+xy2
=4+4xy+xy2