what is the greatest number of real roots a polynomial of degree 4 can have?explain?

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what is the greatest number of real roots a polynomial of degree 4 can have?explain?
what is the greatest number of real roots a polynomial of degree 4 can have?explain?

what is the greatest number of real roots a polynomial of degree 4 can have?explain?
如何求出一个4次多项式的最大实根?请列出解题过程.

什么是最大数量的真正根源一个多项式的学位4可以吗?解释一下吗?

(实根度为4的多项式可以有什么是最大的数?)解释一下吗?