二次项的系数为:3+4+m,
则有3+4+m=0,
解得:m=-7.
故答案为:-7.
要使多项式3x2-2(5+x-2x2)+mx2化简后不含x的二次项,则m是_.
要使多项式3x2-2(5+x-2x2)+mx2化简后不含x的二次项,则m是___.
数学人气:814 ℃时间:2019-12-15 05:56:59
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