若m-n=7,mn=5求(3m-5n+4mn)-(2m-4n+6mn)要计算过程]
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若m-n=7,mn=5求(3m-5n+4mn)-(2m-4n+6mn)要计算过程]
![若m-n=7,mn=5求(3m-5n+4mn)-(2m-4n+6mn)要计算过程]](/uploads/image/z/16920256-40-6.jpg?t=%E8%8B%A5m-n%3D7%2Cmn%3D5%E6%B1%82%283m-5n%2B4mn%29-%282m-4n%2B6mn%29%E8%A6%81%E8%AE%A1%E7%AE%97%E8%BF%87%E7%A8%8B%5D)
(3m-5n+4mn)-(2m-4n+6mn)=3m-5m+4mn-2m+4n-6mn=m-n-2mn=7-10=-3
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