问答题

指出下列计算中的错误且说明理由:
   (1)
   (2),所以
   (3)

A.174.24.96:6088/Latex/latex.action?latex=XGludF97LTF9XnsxfVxmcmFje2R4fXsxK3heezJ9fT0tXGludF97LTF9XnsxfVxmcmFje2RcbGVm%0D%0AdCggXGZyYWN7MX17eH0gXHJpZ2h0KX17MStcbGVmdCggXGZyYWN7MX17eH0gXHJpZ2h0KV57Mn19%0D%0APS1cbGVmdFsgXGFyY3RhblxmcmFjezF9e3h9IFxyaWdodF1fey0xfV57MX09LVxmcmFje1xwaX17%0D%0AMn0%3D'
B.174.24.96:6088/Latex/latex.action?latex=XGludF97LTF9XnsxfVxmcmFje2R4fXt4XnsyfSsxfVx1bmRlcmxpbmV7XHVuZGVybGluZXt4PVxm%0D%0AcmFjezF9e3R9fX0tXGludF97LTF9XnsxfVxmcmFje2R0fXt0XnsyfSsxfQ%3D%3D'
C.174.24.96:6088/Latex/latex.action?latex=XGludF97LTF9XnsxfVxmcmFje2R4fXt4XnsyfSsxfT0w'
D.174.24.96:6088/Latex/latex.action?latex=XGludF97LVxpbmZ0eX1ee1xpbmZ0eX1cZnJhY3t4XnszfX17MSt4Xns0fX1keD1cbGltX3tiXHRv%0D%0AK1xpbmZ0eX1caW50X3stYn1ee2J9XGZyYWN7eF57M319ezEreF57NH19PTA%3D'
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