因式分解：-1/2n²+2m²

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因式分解：-1/2n²+2m²因式分解：-1/2n²+2m²因式分解：-1/2n²+2m²-1/2n²+2m²=-1/2

因式分解：-1/2n²+2m²
因式分解：-1/2n²+2m²

因式分解：-1/2n²+2m²
-1/2n²+2m²
=-1/2(n²-4m²)
=-1/2(n+2m)(n-2m)

原式=1/2(4m²-n²)
=1/2(2m+n)(2m-n)

-1/2n²+2m²
=1/2(4m²-n²)
=1/2(2m+n)(2m-n)