已知多项式(2mx²-x²+3x-1)-(5x²-4y²+3x)不含x²项.求2m³-【3m²+(4m-5)+m】的值
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![已知多项式(2mx²-x²+3x-1)-(5x²-4y²+3x)不含x²项.求2m³-【3m²+(4m-5)+m】的值](/uploads/image/z/402014-38-4.jpg?t=%E5%B7%B2%E7%9F%A5%E5%A4%9A%E9%A1%B9%E5%BC%8F%EF%BC%882mx%26%23178%3B-x%26%23178%3B%2B3x-1%EF%BC%89-%EF%BC%885x%26%23178%3B-4y%26%23178%3B%2B3x%EF%BC%89%E4%B8%8D%E5%90%ABx%26%23178%3B%E9%A1%B9.%E6%B1%822m%26%23179%3B-%E3%80%903m%26%23178%3B%2B%EF%BC%884m-5%EF%BC%89%2Bm%E3%80%91%E7%9A%84%E5%80%BC)
已知多项式(2mx²-x²+3x-1)-(5x²-4y²+3x)不含x²项.求2m³-【3m²+(4m-5)+m】的值
已知多项式(2mx²-x²+3x-1)-(5x²-4y²+3x)不含x²项.
求2m³-【3m²+(4m-5)+m】的值
已知多项式(2mx²-x²+3x-1)-(5x²-4y²+3x)不含x²项.求2m³-【3m²+(4m-5)+m】的值
(2mx²-x²+3x-1)-(5x²-4y²+3x)
=(2m-1-5)x²+3x-1+4y²-3x
不含x²项所以2m-1-5=0
解得,m=3
2m³-【3m²+(4m-5)+m】
=2m³-3m²-(4m-5)-m
=2m³-3m²-5m+5
=2*3³-3³-10
=3³-10
=17