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если члены полинома расположены в порядке убывания степеней x stresses
math.	if a polynomial is arranged in decreasing power of x (, but with the terms having zero coefficients omitted, there is said to be a variation in signs whenever two successive terms of the polynomial are opposite in sign; ...); if a polynomial is arranged in decreasing power of x (, but with the terms having zero coefficients omitted, there is said to be a variation in signs whenever two successive terms of the polynomial are opposite in sign)