数学题,请解答,
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2x^2y-x^3-xy^2
=x(2xy-x^2-y^2)
=-x(x^2-2xy+y^2)
=-x(x-y)^2
(x^2+1)^2-4x^2
=[(x^2+1)+2x][(x^2+1)-2x]
=(x+1)^2(x-1)^2
(2x-y)^2-2(2x-y)+1
=[(2x-y)-1]^2
=(2x-y-1)^2
原式=(x+y)^2-2(x+y)(x-y)+(x-y)^2
=[(x+y)-(x-y)]^2
=(2y)^2
=4y^2
=x(2xy-x^2-y^2)
=-x(x^2-2xy+y^2)
=-x(x-y)^2
(x^2+1)^2-4x^2
=[(x^2+1)+2x][(x^2+1)-2x]
=(x+1)^2(x-1)^2
(2x-y)^2-2(2x-y)+1
=[(2x-y)-1]^2
=(2x-y-1)^2
原式=(x+y)^2-2(x+y)(x-y)+(x-y)^2
=[(x+y)-(x-y)]^2
=(2y)^2
=4y^2
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(1) 2x²y-x³-xy²
=-x(-2xy+x²+y²)
=-x(x-y)²
(2) (x²+1)²-4x²
=(x²+1+2x)(x²+1-2x)
=(x+1)²(x-1)²
(3) (2x-y)²-2(2x-y)+1
=(2x-y-1)²
(4) (x+y)²-2(x²-y²)+(x-y)²
=[(x+y)-(x-y)]²
=(x+y-x+y)²
=(2y)²
=4y²
=-x(-2xy+x²+y²)
=-x(x-y)²
(2) (x²+1)²-4x²
=(x²+1+2x)(x²+1-2x)
=(x+1)²(x-1)²
(3) (2x-y)²-2(2x-y)+1
=(2x-y-1)²
(4) (x+y)²-2(x²-y²)+(x-y)²
=[(x+y)-(x-y)]²
=(x+y-x+y)²
=(2y)²
=4y²
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(1) 2x²y-x³-xy²
=-x(-2xy+x²+y²)
=-x(x-y)²
(2) (x²+1)²-4x²
=(x²+1+2x)(x²+1-2x)
=(x+1)²(x-1)²
(3) (2x-y)²-2(2x-y)+1
=(2x-y-1)²
(4) (x+y)²-2(x²-y²)+(x-y)²
=(x+y)²-2(x+y(x-y))+(x-y)²
=[(x+y)-(x-y)]²
=(x+y-x+y)²
=(2y)²
=4y²
=-x(-2xy+x²+y²)
=-x(x-y)²
(2) (x²+1)²-4x²
=(x²+1+2x)(x²+1-2x)
=(x+1)²(x-1)²
(3) (2x-y)²-2(2x-y)+1
=(2x-y-1)²
(4) (x+y)²-2(x²-y²)+(x-y)²
=(x+y)²-2(x+y(x-y))+(x-y)²
=[(x+y)-(x-y)]²
=(x+y-x+y)²
=(2y)²
=4y²
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