x^2-2xy-4z^2+y^2 phân tích nhân tử
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x2 - 2xy - 4z2 + y2
= (x2 - 2xy+y2) - (2z)2
= (x-y)2- (2z)2
= (x-y-2z)(x-y+2z)
x2-2xy-4z2+y2
=(x2-2xy+y2)-(2z)2
=(x-y)2-(2z)2
=(x-y-2z)(x-y+2z)
a) x2 - y2 + 4x + 4
= ( x2 + 4x + 4 ) - y2
= ( x + 2 )2 - y2
= ( x + 2 - y )( x + 2 + y )
b) x2 - 2xy + y2 - 1
= ( x2 - 2xy + y2 ) - 1
= ( x - y )2 - 12
= ( x - y - 1 )( x - y + 1 )
c) x2 - 2xy + y2 - 4
= ( x2 - 2xy + y2 ) - 4
= ( x - y )2 - 22
= ( x - y - 2 )( x - y + 2 )
d) x2 - 2xy + y2 - z2
= ( x2 - 2xy + y2 ) - z2
= ( x - y )2 - z2
= ( x - y - z )( x - y + z )
e) 25 - x2 + 4xy - 4y2
= 25 - ( x2 - 4xy + 4y2 )
= 52 - ( x - 2y )2
= ( 5 - x + 2y )( 5 + x - 2y )
f) x2 + y2 - 2xy - 4z2
= ( x2 - 2xy + y2 ) - 4z2
= ( x - y )2 - ( 2z )2
= ( x - y - 2z )( x - y + 2z )
\(5x^2-10xy+5y^2-20z^2=5\left(x^2-2xy+y^2-4z^2\right)=5.\left[\left(x-y\right)^2-\left(2z\right)^2\right]=5.\left(x-y-2z\right).\left(x-y+2z\right)\)
\(x^2-z^2+y^2-2xy=\left(x-y\right)^2-z^2=\left(x-y+z\right)\left(x-y-z\right)\)
\(x^2-2xy-4z^2+y^2=\left(x-y\right)^2-4z^2=\left(x-y-2z\right)\left(x-y+2z\right)\)
a) 5x2 - 10xy + 5y2
= 5 (x2 - 2xy + y2)
= 5 (x - y)2
b) x2 - z2 + y2 - 2xy
= (x2 + y2 - 2xy) - z2
= (x2 - 2xy + y2) - z2
= (x - y)2 - z2
= (x - y + z)(x - y - z)
c) x2 - 6xy - 25z2 : hinh nhu de bi sai , ban xem lai giup minh
d) x2 - 2xy - 4z2 + y2
= (x2 - 2xy + y2) - 4z2
= (x - y)2 - (2z)2
= (x - y + 2z)(x - y - 2z)
Chuc ban hoc tot
Bài 1:
\(=3x^3y-6x^2y^2+15xy\)
Bài 2:
\(=\left(x+y\right)^2-25=\left(x+y+5\right)\left(x+y-5\right)\)
\(x^2+2xy-25+y^2\\ =\left(x^2+2xy+y^2\right)-5^2\\ =\left(x+y\right)^2-5^2\\ =\left(x+y-5\right)\left(x+y+5\right)\)
1) \(x^2-x-y^2-y=\left(x^2-y^2\right)-\left(x+y\right)=\left(x-y\right)\left(x+y\right)-\left(x+y\right)=\left(x+y\right)\left(x-y-1\right)\)
\(x^2-2xy+y^2-z^2=\left(x-y\right)^2-z^2=\left(x-y-z\right)\left(x-y+z\right)\)
2)\(5x-5y+ax-ay=5\left(x-y\right)+a\left(x-y\right)=\left(x-y\right)\left(a+5\right)\)
\(a^3-a^2x-ay+xy=a^2\left(a-x\right)-y\left(a-x\right)=\left(a-x\right)\left(a^2-y\right)\)
( x + y + z )2 + ( x + y - z )2 - 4z2
= [ ( x + y ) + z ]2 + [ ( x + y ) - z ]2 - 4z2 (1)
Đặt \(\hept{\begin{cases}x+y=a\\z=b\end{cases}}\)
(1) <=> ( a + b )2 + ( a - b )2 - 4b2
= a2 + 2ab + b2 + a2 - 2ab + b2 - 4b2
= 2a2 - 2b2
= 2( a2 - b2 )
= 2( a - b )( a + b )
= 2( x + y - z )( x + y + z )
\(x^2-2xy+y^2-\left(2z\right)^2\)
\(=\left(x-y\right)^2-\left(2z\right)^2\)
\(=\left(x-y-2z\right)\times\left(x-y+2z\right)\)
XIN TiiCK