Răspuns:
Explicație pas cu pas:
b) 10b+a+b=58 a+11b=58 a+11b=58
10a+b+10b+a=88 11a+11b=88 (:11) -a-b=-8
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10b=50 b=5 si a=3
c)10a+b+a=29 11a+b=29 11a+b=29
10a+b-10b-a=-45 9a-9b=-45 a-b=-5
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12a=24 a=2 b=7
