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单词 de Gua's rule
释义 de Gua's rule
[dǝ`gwäz ´rül]
MATHEMATICS
The rule that if, in a polynomial equation f (x ) = 0, a group of r consecutive terms is missing, then the equation has at least r imaginary roots if r is even, or the equation has at least r + 1 or r - 1 imaginary roots if r is odd (depending on whether the terms immediately preceding and following the group have like or unlike signs).
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