2m的2次方-mn-3m的2次方n-2nm的2次方+5mn

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2m的2次方-mn-3m的2次方n-2nm的2次方+5mn

2m²-mn-3m²n-2nm²+5mn
=2m²-3m²n-2nm²+4mn
=2m²-5m²n+4mn
=m²(2-5n)+4mn