Răspuns :
numerele care se pot rotunji la 10= 8,9,11,12,13,14
numerele care se pot rotunji la 20= 17,18,19,21,22,23
numerele care se pot rotunji la 30=27,28,29,31,32,33,34
numerele care se pot rotunji la 20= 17,18,19,21,22,23
numerele care se pot rotunji la 30=27,28,29,31,32,33,34
la 10: 9,8,7,6,11,12,13,14
la 20: 16,17,18,19,21,22,23,24
la 30: 26,27,28,29,31,32,33,34
la 20: 16,17,18,19,21,22,23,24
la 30: 26,27,28,29,31,32,33,34