已知整式mx²-mx-2与3x²+mx+m的和是单项式,求代数式3m²n-{-[-7m²n-5mn²+﹙2m²n-3mn²﹚+2mn²]-2﹙m²n+
已知整式mx²-mx-2与3x²+mx+m的和是单项式,求代数式3m²n-{-[-7m²n-5mn²+﹙2m²n-3mn²﹚+2mn²]-2﹙m²n+3mn²﹚+m﹜的值.
其他人气:936 ℃时间:2019-10-08 16:33:25
优质解答
mx²-mx-2+3x²+mx+m=(m+3)x²+(m-2)所以m=-3或m=23m²n-{-[-7m²n-5mn²+﹙2m²n-3mn²﹚+2mn²]-2﹙m²n+3mn²﹚+m﹜=3m²n-7m²n-5mn²...
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