约分:(1)20xy^3/-16x^2y (2)m-n/n2-m2 (3)2x^2-2/x^2+2x+1

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约分:(1)20xy^3/-16x^2y (2)m-n/n2-m2 (3)2x^2-2/x^2+2x+1
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约分:(1)20xy^3/-16x^2y (2)m-n/n2-m2 (3)2x^2-2/x^2+2x+1
约分:(1)20xy^3/-16x^2y (2)m-n/n2-m2 (3)2x^2-2/x^2+2x+1

约分:(1)20xy^3/-16x^2y (2)m-n/n2-m2 (3)2x^2-2/x^2+2x+1
1,20xy³/(-16x²y)=-5y²/4x.
2,(m-n)/(n²-m²)=(m-n)/(n+m)(n-m)=-1/(m+n),
3,(2x²-2)/(x²+2x+1)=2(x+1)(x-1)/(x+1)²=2(x-1)/(x+1)..