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zxc210188

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(1)Prove that a nonempty set

(2)Give an example showing that the union of two subspaces of a vector space V is not necessarily a subspaces of V

**W**is a subspce of a vector space**V**iff a**x**+b**y**is an element of**W**for all scalars a and b and all vectors**x**and**y**in W(2)Give an example showing that the union of two subspaces of a vector space V is not necessarily a subspaces of V

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