问答题

设X1,X2,…,Xn是赋范空间。证明下面给出了X1×…×Xn上的等价范数:
   ,xi∈Xi
  ,xi∈Xi
  ,xi∈Xi

A.174.24.96:6088/Latex/latex.action?latex=4oCWKHhfezF9LHhfezJ9LFxjZG90cyAseF97bn0p4oCWX3sxfT1cc3VtX3tpPTF9XntufeKAlnhf%0D%0Ae2l94oCW'
B.174.24.96:6088/Latex/latex.action?latex=4oCWKHhfezF9LHhfezJ9LFxjZG90cyAseF97bn0p4oCWX3syfT1cbGVmdChcc3VtX3tpPTF9Xntu%0D%0AfeKAlnhfe2l94oCWXnsyfVxyaWdodCleezEvMn0%3D'
C.174.24.96:6088/Latex/latex.action?latex=4oCWKHhfezF9LHhfezJ9LFxjZG90cyAseF97bn0p4oCWX3viiJ59PV97MeKJpGniiaRufV57bWF4%0D%0AfeKAlnhfe2l94oCW'
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