求比多项式7m²-4mn-n²少2m²-mn+2n²的多项式,

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求比多项式7m²-4mn-n²少2m²-mn+2n²的多项式,

求比多项式7m²-4mn-n²少2m²-mn+2n²的多项式,
求比多项式7m²-4mn-n²少2m²-mn+2n²的多项式,

求比多项式7m²-4mn-n²少2m²-mn+2n²的多项式,
(7m²-4mn-n²)-(2m²-mn+2n²)=5m²-3mn-3n²