作业帮帮我看看下面的数学题怎么写,（2mx²-x²+3x+1）-(5x²-4y²+3x)的值与x无关,求2m³-[3m²+(4m-5)+m]的值.
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![帮我看看下面的数学题怎么写,（2mx²-x²+3x+1）-(5x²-4y²+3x)的值与x无关,求2m³-[3m²+(4m-5)+m]的值.](/uploads/image/z/7619245-61-5.jpg?t=%E5%B8%AE%E6%88%91%E7%9C%8B%E7%9C%8B%E4%B8%8B%E9%9D%A2%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%98%E6%80%8E%E4%B9%88%E5%86%99%2C%EF%BC%882mx%26%23178%3B-x%26%23178%3B%2B3x%2B1%EF%BC%89-%285x%26%23178%3B-4y%26%23178%3B%2B3x%29%E7%9A%84%E5%80%BC%E4%B8%8Ex%E6%97%A0%E5%85%B3%2C%E6%B1%822m%26%23179%3B-%5B3m%26%23178%3B%2B%284m-5%29%2Bm%5D%E7%9A%84%E5%80%BC.)
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帮我看看下面的数学题怎么写,（2mx²-x²+3x+1）-(5x²-4y²+3x)的值与x无关,求2m³-[3m²+(4m-5)+m]的值.
帮我看看下面的数学题怎么写,
（2mx²-x²+3x+1）-(5x²-4y²+3x)的值与x无关,求2m³-[3m²+(4m-5)+m]的值.
帮我看看下面的数学题怎么写,（2mx²-x²+3x+1）-(5x²-4y²+3x)的值与x无关,求2m³-[3m²+(4m-5)+m]的值.
（2mx²-x²+3x+1）-(5x²-4y²+3x)=2mx²-6x²+4y²+1与x无关,
所以2mx²=6x²,
m=3
即2m³-[3m²+(4m-5)+m]=2x3³-[3x2²+(4x3-5)+3]=32