要使mx²+2nxy-x+x²-2xy+y不含二次项,则3m-2n的值为?(m+1)x²+(2n-2)xy-x+y这一步是什么意思?可以帮忙解答一下吗?万般感谢
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![要使mx²+2nxy-x+x²-2xy+y不含二次项,则3m-2n的值为?(m+1)x²+(2n-2)xy-x+y这一步是什么意思?可以帮忙解答一下吗?万般感谢](/uploads/image/z/8665579-19-9.jpg?t=%E8%A6%81%E4%BD%BFmx%26%23178%3B%2B2nxy-x%2Bx%26%23178%3B-2xy%2By%E4%B8%8D%E5%90%AB%E4%BA%8C%E6%AC%A1%E9%A1%B9%2C%E5%88%993m-2n%E7%9A%84%E5%80%BC%E4%B8%BA%3F%28m%2B1%29x%26%23178%3B%2B%282n-2%29xy-x%2By%E8%BF%99%E4%B8%80%E6%AD%A5%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D%3F%E5%8F%AF%E4%BB%A5%E5%B8%AE%E5%BF%99%E8%A7%A3%E7%AD%94%E4%B8%80%E4%B8%8B%E5%90%97%3F%E4%B8%87%E8%88%AC%E6%84%9F%E8%B0%A2)
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要使mx²+2nxy-x+x²-2xy+y不含二次项,则3m-2n的值为?(m+1)x²+(2n-2)xy-x+y这一步是什么意思?可以帮忙解答一下吗?万般感谢
要使mx²+2nxy-x+x²-2xy+y不含二次项,则3m-2n的值为?
(m+1)x²+(2n-2)xy-x+y
这一步是什么意思?可以帮忙解答一下吗?
万般感谢
要使mx²+2nxy-x+x²-2xy+y不含二次项,则3m-2n的值为?(m+1)x²+(2n-2)xy-x+y这一步是什么意思?可以帮忙解答一下吗?万般感谢
这一步是合并同类项.
mx²+2nxy-x+x²-2xy+y=(m+1)x²+(2n-2)xy-x+y
不含二次项,二次项系数=0
m+1=0 m=-1
2n-2=0 n=1
3m-2n=3×(-1)-2×1=-5