问答题

设V1,V2是欧氏空间V的两个子空间,证明:
   (1)
   (2)

A.174.24.96:6088/Latex/latex.action?latex=XGxlZnQoIFZfezF9K1ZfezJ9IFxyaWdodClee1xwZXJwfT1WX3sxfV57XHBlcnB9XGNhcCBWX3sy%0D%0AfV57XHBlcnB9'
B.174.24.96:6088/Latex/latex.action?latex=XGxlZnQoIFZfezF9XGNhcCBWX3syfSBccmlnaHQpXntccGVycH09Vl97MX1ee1xwZXJwfStWX3sy%0D%0AfV57XHBlcnB9'
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