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\(Sửa:x^2+2xy+y^2-16\\ =\left(x+y\right)^2-16\\ =\left(x+y-4\right)\left(x+y+4\right)\)
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=\(-\left(x^2-2xy+y^2\right)+16=16-\left(x-y\right)^2=\left(4-x+y\right)\left(4+x-y\right)\)
\(-x^2+2xy-y^2+16\)
\(=-\left(x^2-2xy+y^2-16\right)\)
\(=-\left(x-y-4\right)\left(x-y+4\right)\)
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1: =(16x^2-8x+1)-y^2
=(4x-1)^2-y^2
=(4x-1-y)(4x-1+y)
2: =(x^2-2xy+y^2)-z^2
=(x-y)^2-z^2
=(x-y-z)(x-y+z)
3: =(x^2+4xy+4y^2)-16
=(x+2y)^2-4^2
=(x+2y-4)(x+2y+4)
4: =(x^2-4xy+4y^2)-16
=(x-2y)^2-4^2
=(x-2y-4)(x-2y+4)
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\(2xy-x^2-y^2-16\)
\(=-\left(x^2-2xy+y^2\right)-4^2\)
\(=-\left(x-y\right)^2-4^2\)
\(=\left(-x-y-4\right)\left(-x-y+4\right)\)
bạn ơi!! phải đỏi dấu chứ!
cuối cùng phải là (-x+y-4)(-x+y+4)
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\(2xy-x^2-y^2+16\\ =16-\left(x-y\right)^2\\ =\left(4-x+y\right)\left(4+x-y\right)\)
2xy -x2-y2+16
=-x2+2xy-y2+16
=-(x2-2xy+y2-16)
=-[(x-y)2-16]
=16-(x-y)2
= 42-(x-y)2
=(4-x+y)(4+x-y)
2xy - x2 - y2 + 16
= 16 - ( x2 - 2xy + y2 )
= 42 - ( x - y )2
= ( 4 - x + y )( 4 + x - y )