Răspuns :
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ab=11, 22, 33, 44, 55, 66, 77, 88, 99.
__
ba=11, 22, 33, 44, 55, 66, 77, 88, 99.
ab=11, 22, 33, 44, 55, 66, 77, 88, 99.
__
ba=11, 22, 33, 44, 55, 66, 77, 88, 99.
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ab=ba....=>a=b
11=11....=>1*10+1=1*10+1⇔10+1=10+1⇔11=11
22=22...=>2*10+2=2*10+2⇔20+2=20+2⇔22=22
33=33
44=44
55=55
66=66
77=77
88=88
99=99
ab=ba....=>a=b
11=11....=>1*10+1=1*10+1⇔10+1=10+1⇔11=11
22=22...=>2*10+2=2*10+2⇔20+2=20+2⇔22=22
33=33
44=44
55=55
66=66
77=77
88=88
99=99