问道数学题(3mn-5x²)-(3m²-5mn)
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问道数学题(3mn-5x²)-(3m²-5mn)问道数学题(3mn-5x²)-(3m²-5mn)问道数学题(3mn-5x²)-(3m²-5m
问道数学题(3mn-5x²)-(3m²-5mn)
问道数学题(3mn-5x²)-(3m²-5mn)
问道数学题(3mn-5x²)-(3m²-5mn)
(3mn-5x²)-(3m²-5mn)
= 3mn-5x²-3m²+5mn
= -5x²-3m²+8mn
(3mn-5n^2)-(3m^2-5mn)=3mn-5n^2-3m^2+5mn=3m(n-m)-5n(n-m)=(3m-5n)(n-m)