b) x2 - 2x - 4y2 - 4y
= x2 - 2x + 1 - 4y2 - 4y - 1
= ( x - 1 )2 - [ ( 2y )2 + 2.2.y + 1 ]
= ( x - 1 )2 - ( 2y + 1 )2
= ( x - 1 + 2y + 1 ).( x - 1 - 2y - 1 )
= ( x + 2y ).( x - 2y - 2 )
Đúng 0
Bình luận (0)
Bài làm
a) xz - yz - x2 + 2xy - y2
= ( xz - yz ) - ( x2 - 2xy + y2 )
= z( x - y ) - ( x - y )2
= ( x - y )( z - x + y )
b) x2 - 2x - 4y2 - 4y
= x2 - 2x - 4y2 - 4y + 1 - 1
= ( x2 - 2x + 1 ) - ( 4y2 + 4y + 1 )
= ( x - 1 )2 - ( 2y + 1 )2
= ( x - 1 - 2y - 1 )( x - 1 + 2y + 1 )
= ( x - 2y - 2 )( x + 2y )
# Học tốt #
