多项式5x²-2mxy-3y²与多项式6xy-9x+5的和中不含xy项,求代数式﹙-m³+2m²+m-9﹚-﹙m³+2m²+m-9﹚的值
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![多项式5x²-2mxy-3y²与多项式6xy-9x+5的和中不含xy项,求代数式﹙-m³+2m²+m-9﹚-﹙m³+2m²+m-9﹚的值](/uploads/image/z/7103728-64-8.jpg?t=%E5%A4%9A%E9%A1%B9%E5%BC%8F5x%26%23178%3B-2mxy-3y%26%23178%3B%E4%B8%8E%E5%A4%9A%E9%A1%B9%E5%BC%8F6xy-9x%2B5%E7%9A%84%E5%92%8C%E4%B8%AD%E4%B8%8D%E5%90%ABxy%E9%A1%B9%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%B9%99-m%26%23179%3B%2B2m%26%23178%3B%2Bm-9%EF%B9%9A-%EF%B9%99m%26%23179%3B%2B2m%26%23178%3B%2Bm-9%EF%B9%9A%E7%9A%84%E5%80%BC)
多项式5x²-2mxy-3y²与多项式6xy-9x+5的和中不含xy项,求代数式﹙-m³+2m²+m-9﹚-﹙m³+2m²+m-9﹚的值
多项式5x²-2mxy-3y²与多项式6xy-9x+5的和中不含xy项,
求代数式﹙-m³+2m²+m-9﹚-﹙m³+2m²+m-9﹚的值
多项式5x²-2mxy-3y²与多项式6xy-9x+5的和中不含xy项,求代数式﹙-m³+2m²+m-9﹚-﹙m³+2m²+m-9﹚的值
﹙-m³+2m²+m-9﹚-﹙m³+2m²+m-9﹚
=-m³+2m²+m-9-m³-2m²-m+9
=-2m³
-2m=6,则m=-3,剩下的自己算吧