数学题:已知多项式(2mx²+5x²+3x+1)-(6x²-4y²+3x)化简后不含x²项,求多项式2m³-【3m³-(4m-5)+m】的值
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![数学题:已知多项式(2mx²+5x²+3x+1)-(6x²-4y²+3x)化简后不含x²项,求多项式2m³-【3m³-(4m-5)+m】的值](/uploads/image/z/120688-16-8.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%9A%E5%B7%B2%E7%9F%A5%E5%A4%9A%E9%A1%B9%E5%BC%8F%282mx%26%23178%3B%2B5x%26%23178%3B%2B3x%2B1%29-%286x%26%23178%3B-4y%26%23178%3B%2B3x%29%E5%8C%96%E7%AE%80%E5%90%8E%E4%B8%8D%E5%90%ABx%26%23178%3B%E9%A1%B9%2C%E6%B1%82%E5%A4%9A%E9%A1%B9%E5%BC%8F2m%26%23179%3B-%E3%80%903m%26%23179%3B-%EF%BC%884m-5%EF%BC%89%2Bm%E3%80%91%E7%9A%84%E5%80%BC)
数学题:已知多项式(2mx²+5x²+3x+1)-(6x²-4y²+3x)化简后不含x²项,求多项式2m³-【3m³-(4m-5)+m】的值
数学题:已知多项式(2mx²+5x²+3x+1)-(6x²-4y²+3x)
化简后不含x²项,求多项式2m³-【3m³-(4m-5)+m】的值
数学题:已知多项式(2mx²+5x²+3x+1)-(6x²-4y²+3x)化简后不含x²项,求多项式2m³-【3m³-(4m-5)+m】的值
(2mx²+5x²+3x+1)-(6x²-4y²+3x)
=(2m-6+5)x²+3x+1-(-4y²+3x)
不含x² (2m-6+5)=0
2m=1
m=1/2
2m³-【3m³-(4m-5)+m】
=-m³+(4m-5)-m
=-m³+3m-5
=m(-m²+3)-5
=1/2*(-1/4+3)-5
=-29/8