LECON NR 13 SIGNES vaas EXERCICE NR 3 = asva+/,  va/?+'  as'?va+  ,?va/'  as/va.+  ,va.as+  +'va'as  ?va,+'  ,+/?.  .,+va'  ?/,vaas  +,/'.  +/as.'  ?,+va'  ./?vaas  +/va?.  ?/.va,  as,as'/ =