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a, xy + xz - 2y - 2z
= x(y + z) - 2(y + z)
= (x - 2)(y + x)
b, x2 - 6xy + 9y2 - 25z2
= (x - 3y)2 - 25z2
= (x - 3y - 5z)(x - 3y + 5z)
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\(4x^2+4x-9y^2+1\\ =\left(4x^2+4x+1\right)-9y^2\\ =\left(2x+1\right)^2-9y^2\\ =\left(2x+1\right)^2-\left(3y\right)^2\\ =\left[\left(2x+1\right)+3y\right]\left[\left(2x+1\right)-3y\right]\\ =\left(2x+1+3y\right)\left(2x+1-3y\right)\)
\(x^2-6xy+9y^2-25z^2\\ =\left(x^2-6xy+9y^2\right)-25z^2\\ =\left(x-3y\right)^2-25z^2\\ =\left(x-3y\right)^2-\left(5z\right)^2\\ =\left[\left(x-3y\right)+5z\right]\left[\left(x-3y\right)-5z\right]\\ =\left(x-3y+5z\right)\left(x-3y-5z\right)\)
\(x^2-xy+x-y\\ =\left(x^2-xy\right)+\left(x-y\right)\\ =x\left(x-y\right)+\left(x-y\right)\\ =\left(x-y\right)\left(x-1\right)\)
= ( x - 3y )^2 - (5z)^2
= ( x - 3y - 5z ) ( x - 3y + 5z )
x2 - 6xy - 25z2 + 9y2
= (x - 3y)2 - (5z)2
= (x - 3y - 5z) . (x - 3y + 5z)
# Học tốt #
a)\(x^2-6xy+9y^2-25z^2=\left[x^2-2.x.3y+\left(3y\right)^2\right]-\left(5z\right)^2\)
\(=\left(x-3y\right)^2-\left(5z\right)^2=\left(x-3y-5z\right)\left(x-3y+5z\right)\)
b)\(xyz+x^2yz-6yz=yz\left(x^2+x-6\right)=yz\left(x^2+3x-2x-6\right)\)
\(=yz\left[x\left(x+3\right)-2\left(x+3\right)\right]=yz\left(x-2\right)\left(x+3\right)\)
a.x2-6xy+9y2-25z2
= ( x2-6xy+9y2)-25z2
= [x2-2x3y+(3y)2]-25z2
= (x-3y)2-252
= (x-3y+25)(x-3y-25)
\(a=\left(x+1\right)^2-\left(4y\right)^2=\left(x+1-4y\right)\left(x+1+4y\right)\)
\(b=\left(x+3\right)^2-y^2=\left(x+3+y\right)\left(x+3-y\right)\)
\(c=\left(2x+1\right)^2-\left(3y\right)^2=\left(2x+1-3y\right)\left(2x+1+3y\right)\)
\(d=\left(x+3y\right)^2-\left(5z\right)^2=\left(x+3y-5z\right)\left(x+3y+5z\right)\)
Lời giải:
1. $xy+xz-2y-2z=(xy+xz)-(2y+2z)$
$=x(y+z)-2(y+z)=(x-2)(y+z)$
2. $x^2-6xy+9y^2)-25z^2$
$=(x-3y)^2-(5z)^2=(x-3y-5z)(x-3y+5z)$
3.
$3x^2-3y^2-12x+12y=(3x^2-3y^2)-(12x-12y)=3(x^2-y^2)-12(x-y)=3(x-y)(x+y)-12(x-y)=3(x-y)(x+y-4)$
a) \(x^3-3x^2+1-3x\)
\(=\left(x^3+1\right)-\left(3x^2+3x\right)\)
\(=\left(x+1\right)\left(x^2-x+1\right)-3x\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2-x+1-3x\right)\)
\(=\left(x+1\right)\left(x^2-4x+1\right)\)
\(=\left(x+1\right)\left(x^2-4x+4-5\right)\)
\(=\left(x+1\right)\left[\left(x-2\right)^2-5\right]\)
\(=\left(x+1\right)\left(x-2-\sqrt{5}\right)\left(x-2+\sqrt{5}\right)\)
b) \(x^2-6xy-25z^2+9y^2\)
\(=\left(x^2-6xy+9y^2\right)-25z^2\)
\(=\left(x-3y\right)^2-25z^2\)
\(=\left(x-3y-5z\right)\left(x-3y+5z\right)\)
c) \(x^2-y^2-x-y\)
\(=\left(x-y\right)\left(x+y\right)-\left(x+y\right)\)
\(=\left(x+y\right)\left(x-y-1\right)\)
d) \(x^2-y^2+4-4x\)
\(=\left(x^2-4x+4\right)-y^2\)
\(=\left(x-2\right)^2-y^2\)
\(=\left(x-2-y\right)\left(x-2+y\right)\)
e) \(a^3-ay-a^2x+xy\)
\(=a\left(a^2-y\right)-x\left(a^2-y\right)\)
\(=\left(a^2-y\right)\left(a-x\right)\)
phân tích hả bạn ?
x2 - 6xy - 25z2 + 9y2
= ( x2 - 6xy + 9y2 ) - 25z2
= ( x - 3y )2 - ( 5z )2
= ( x - 3y - 5z )( x - 3y + 5z )