17、20分解因式
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17.
(2x-1)y²+(2x-1)²y
=(2x-1)y[y+(2x-1)]
=y(2x-1)(2x+y-1)
20.
4a(x-y)²-2y(y-x)²+(y-x)
=4a(x-y)²-2y(x-y)²-(x-y)
=(x-y)[4a(x-y)-2y(x-y)-1]
=(x-y)(4ax-4ay-2xy+2y²-1)
(2x-1)y²+(2x-1)²y
=(2x-1)y[y+(2x-1)]
=y(2x-1)(2x+y-1)
20.
4a(x-y)²-2y(y-x)²+(y-x)
=4a(x-y)²-2y(x-y)²-(x-y)
=(x-y)[4a(x-y)-2y(x-y)-1]
=(x-y)(4ax-4ay-2xy+2y²-1)
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17)原式=y(2x-1)[y+(2x-1)]=y(2x-1)(y+2x-1)
20)原式=(y-x)[4a(y-x)-2y(y-x)+1]=(y-x)(4ay-4ax-2y^2+2xy+1)
20)原式=(y-x)[4a(y-x)-2y(y-x)+1]=(y-x)(4ay-4ax-2y^2+2xy+1)
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