(3mn-5m的2次方)-(3m的2次方-5mn)

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(3mn-5m的2次方)-(3m的2次方-5mn)(3mn-5m的2次方)-(3m的2次方-5mn)(3mn-5m的2次方)-(3m的2次方-5mn)﹙3mn-25m²﹚-﹙9m²

(3mn-5m的2次方)-(3m的2次方-5mn)
(3mn-5m的2次方)-(3m的2次方-5mn)

(3mn-5m的2次方)-(3m的2次方-5mn)
﹙3mn-25m²﹚-﹙9m²-5mn﹚=3mn-25m²-9m²+45mn=42mn-34m²=2m﹙21n-17m﹚