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=xy ( x + y ) + z ( x^2 + 2xy + y^2 ) = xy ( x + y ) + z ( x + y ) ^ 2 = ( x + y ) ( xy + xz + yz )
\(x^2-x-xy-2y^2+2y\)
\(=x^2-x-2xy+xy-2y^2+2y\)
\(=\left(-2y^2-2xy+2y\right)+\left(xy+x^2-x\right)\)
\(=2y\left(-y-x+1\right)-x\left(-y-x+1\right)\)
\(=\left(2y-x\right)\left(-y-x+1\right)\)
phân tích đa thức thành nhân tử bằng cách nhóm hạng tử
1) x2 - y2 - 2x - 2y
2) 3x2 - 3y2 - 2(x - y)2
1) \(x^2-y^2-2x-2y\)
\(=\left(x^2-y^2\right)-\left(2x+2y\right)\)
\(=\left(x+y\right)\left(x-y\right)-2\left(x+y\right)\)
\(=\left(x+y\right)\left(x-y-2\right)\)
2) \(3x^2-3y^2-2\left(x-y\right)^2\)
\(=3\left(x^2-y^2\right)-2\left(x-y\right)^2\)
\(=3\left(x-y\right)\left(x+y\right)-2\left(x-y\right)^2\)
\(=\left(x-y\right)\left[3\left(x+y\right)-2\left(x-y\right)\right]\)
\(=\left(x-y\right)\left(3x+3y-2x+2y\right)\)
\(=\left(x-y\right)\left(x+5y\right)\)
1) x² - y² - 2x - 2y
= (x² - y²) - (2x + 2y)
= (x - y)(x + y) - 2(x + y)
= (x + y)(x - y - 2)
2) 3x² - 3y² - 2(x - y)²
= (3x² - 3y²) - 2(x - y)²
= 3(x² - y²) - 2(x - y)²
= 3(x - y)(x + y) - 2(x - y)²
= (x - y)[3(x + y) - 2(x - y)]
= (x - y)(3x + 3y - 2x + 2y)
= (x - y)(x + 5y)
x^2 - xy + x - y = x(x - y) + (x - y) = (x - y)(x + 1)
Bài làm
-x2 - y2 + xy + 16
= -( x2 - xy + y2 ) + 16
= -( x - y )2 + 42
= -[ ( x - y )2 - 42 ]
= - [ ( x - y - 4 )( x - y + 4 ) ]
# Học tốt #
x2 - x - y2 - y
= (x - y)(x + y) - (x + y)
= (x + y)(x - y - 1)
***
9x2 + y2 - 16z2 + 6xy
= (3x + y)2 - (4z)2
= (3x + y - 4z)(3x + y + 4z)
***
a3 - a2x - ay + xy
= a2(a - x) - y(a - x)
= (a - x)(a2 - y)
***
2x2 - 8y2 + 3x + 6y
= 2(x2 - 4y2) + 3(x + 2y)
= 2(x - 2y)(x + 2y) + 3(x + 2y)
= (x + 2y)(2x - 4y + 3)
***
xy(x + y) + yz(y + z) + xz(x + z) + 2xyz
= xy(x + y + z) + yz(x + y + z) + xz(x + z)
= y(x + y + z)(x + z) + xz(x + z)
= (x + z)(xy + y2 + yz + xz)
= (x + z)[y(x + y) + z(x + y)]
= (x + z)(x + y)(y + z)
\(10\left(x-y\right)-8y\left(y-x\right)\)
\(=10\left(x-y\right)+8y\left(x-y\right)\)
\(=\left(x-y\right)\left(10+8y\right)\)
\(=2\left(x-y\right)\left(5+4y\right)\)
a) 10(x-y)-8y(y-x)= 10(x-y)+8y(x-y) = (x-y)(10+8y)=2(x-y)(5+4y)
b) Bạn xem lại đầu bài nhé !
\(x^2+y^2-x^2y^2+xy-x-y\)
\(\Leftrightarrow x^2\left(1-y\right)\left(1+y\right)-y\left(1-y\right)-x\left(1-y\right)\)
\(\Leftrightarrow\left(1-y\right)\left(x^2+x^2y-y-x\right)\)
\(\Leftrightarrow\left(1-y\right)\left(x+y\right)\left(x-1\right)\left(x+1\right)\)
\(=\left(x^2y+xy^2\right)-\left(x+y\right)=xy\left(x+y\right)-\left(x+y\right)=\left(x+y\right)\left(xy-1\right)\)
em cảm ơn cô @Nguyễn Linh Chi ạ !