(x+y)^2-4y^2 (x+y)^2-(x-y+1) 因式分解
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(x+y)^2-4y^2 (x+y)^2-(x-y+1) 因式分解
(x+y)^2-4y^2
(x+y)^2-(x-y+1)
因式分解
(x+y)^2-4y^2
(x+y)^2-(x-y+1)
因式分解
![(x+y)^2-4y^2 (x+y)^2-(x-y+1) 因式分解](/uploads/image/z/20166173-53-3.jpg?t=%EF%BC%88x%2By%EF%BC%89%5E2-4y%5E2+%EF%BC%88x%2By%EF%BC%89%5E2-%EF%BC%88x-y%2B1%EF%BC%89+%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3)
( x + y )" - 4y"
= ( x + y )" - ( 2y )"
= ( x + y - 2y )( x + y + 2y )
= ( x - y )( x + 3y )
( x + y )" - ( x - y + 1 )"
= [ ( x + y ) + ( x - y + 1 ) ][ ( x + y ) - ( x - y + 1 ) ]
= ( x + y + x - y + 1 )( x + y - x + y - 1 )
= ( 2x + 1 )( 2y - 1 )
= ( x + y )" - ( 2y )"
= ( x + y - 2y )( x + y + 2y )
= ( x - y )( x + 3y )
( x + y )" - ( x - y + 1 )"
= [ ( x + y ) + ( x - y + 1 ) ][ ( x + y ) - ( x - y + 1 ) ]
= ( x + y + x - y + 1 )( x + y - x + y - 1 )
= ( 2x + 1 )( 2y - 1 )
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