不一定對
思路：2x^5+8x-7 =0
2x^5+8x=7
2x(x^4+8)=7
可以確定x只能是正值,解只能有一個
麻煩有正確答案后告知一下 哈哈此題是選B,可為什么x只能是正值解就只能有一個呢x^4+8 一定是正值，2x(x^4+8)=7就相當(dāng)于一元一次方程， 例如：6X=9你說X解有幾個？如果答案中有具體的解釋，我還是很期待看看他怎么解釋的哈哈
How many real roots does the polynomial 2x^5+8x-7 have?
How many real roots does the polynomial 2x^5+8x-7 have?
(A)None (B)One(C)Two(D)Three(E)Five
(A)None (B)One(C)Two(D)Three(E)Five
數(shù)學(xué)人氣：142 ℃時間：2020-04-17 17:36:27
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