若x的平方加3x减1等于0,则x的三次方+5x的平方+5x+8等于多少
人气：298 ℃ 时间：2019-08-16 23:38:08
解答
昨天刚回答了一到这样的题
这种题就是凑条件
如果你接触过多项式的除法就比较容易了
没接触过只好一点一点来了
首先让式子出现x2+3x-1,就必须把x3中的x提出来,变成x(x2+3x-1),后面就变成5x2-3x2+5x+x+8,也就是2(x2+3x-1),所以原式等于0
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