因式分解4x²-16和-x²y+4xy-5y
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因式分解4x²-16和-x²y+4xy-5y
因式分解4x²-16和-x²y+4xy-5y
因式分解4x²-16和-x²y+4xy-5y
4x²-16
=4(x²-4)
=4(x+2)(x-2)
-x²y+4xy-5y
=-y(x²-4x+5)
如果本题有什么不明白可以追问,
(2x+4)(2x-4) y(-x²+4x-5)
4x²-16=4(x+2)*(x-2) -x²y+4xy-5y=-y((x-2)^2+1)
4x" - 16
= 4( x" - 4 )
= 4( x" - 2" )
= 4( x - 2 )( x + 2 )
-x"y + 4xy - 5y
= -y ( x" - 4x + 5 )