191*192192-192*191191等于几
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191*192192-192*191191等于几
191*192192-192*191191
=191*192192-(191+1)*191191
=191*(192192-191191)-191191
=191*1001-191191
=0
=191*192192-(191+1)*191191
=191*(192192-191191)-191191
=191*1001-191191
=0