问道数学题(3mn-5x²)-(3m²-5mn)
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![问道数学题(3mn-5x²)-(3m²-5mn)](/uploads/image/z/1350323-35-3.jpg?t=%E9%97%AE%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98%283mn-5x%26%23178%3B%29-%283m%26%23178%3B-5mn%29)
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)