For any numbers a, b, and c,[img]2012q1/ct_egreqm_egreqjs_0230_20121[/img] For w

游客2024-01-12 49

问题 For any numbers a, b, and c,

For which of the following equations is it true that there is exactly one positive integer that satisfies it’?

选项 A、none
B、Ⅰ only
C、Ⅲ only
D、Ⅰ and Ⅲ only
E、Ⅰ, Ⅱ, and Ⅲ

答案 C

解析

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Foranynumberswandz,w·z=w3z(8-w2).Ifbothzandw·zarepositivenumbers,