Răspuns :
La primul exercițiu:
23=20+3
43=40+3
57=50+7
66=60+6
39=30+9
22=20+2
La al doilea exercițiu:
a) 11, 22, 33, 44 ,55 ,66 ,77 ,88 ,99.
b)12,13,14,15,16,17,18,19,23,24,25,26,27,28,29,34,35,36,37,38,39,45,46,47,48,49,56,57,58,59,67,68,69,78,79,89
d) 12,23,34,45,56,67,78,89
e) suma egala cu 8: 17,26,35,44,53,62,71,80
suma egala cu 7: 16,25,34,43,52,61,70
suma egala cu 6: 15,24,33,42,51,60
suma egala cu 9: 18,27,36,45,54,63,72,81,90
suma egala cu 10: 19,28,37,46,55,64,73,82,91
suma egala cu 11: 29,38,47,56,65,74,83,92
suma egala cu 12: 39,48,57,66,75,84,93
suma egala cu 13: 49,58,67,76,85,94
suma egala cu 14: 59,68,77,86,95
suma egala cu 15: 69,78,87,96
suma egala cu 16: 79,88,97
suma egala cu 17: 89,98
suma egala cu 18: 99
Acestea sunt toate variantele! :)
23=20+3
43=40+3
57=50+7
66=60+6
39=30+9
22=20+2
La al doilea exercițiu:
a) 11, 22, 33, 44 ,55 ,66 ,77 ,88 ,99.
b)12,13,14,15,16,17,18,19,23,24,25,26,27,28,29,34,35,36,37,38,39,45,46,47,48,49,56,57,58,59,67,68,69,78,79,89
d) 12,23,34,45,56,67,78,89
e) suma egala cu 8: 17,26,35,44,53,62,71,80
suma egala cu 7: 16,25,34,43,52,61,70
suma egala cu 6: 15,24,33,42,51,60
suma egala cu 9: 18,27,36,45,54,63,72,81,90
suma egala cu 10: 19,28,37,46,55,64,73,82,91
suma egala cu 11: 29,38,47,56,65,74,83,92
suma egala cu 12: 39,48,57,66,75,84,93
suma egala cu 13: 49,58,67,76,85,94
suma egala cu 14: 59,68,77,86,95
suma egala cu 15: 69,78,87,96
suma egala cu 16: 79,88,97
suma egala cu 17: 89,98
suma egala cu 18: 99
Acestea sunt toate variantele! :)