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2014-10-15T22:55:33+03:00
Ab=10a+b
ba=10b+a
10a+b=10b+a+36
9a-9b=36
a-b=4
a ∈ { 5,6,7,8,9}
b ∈ { 1,2,3,4,5}
ab ∈ { 51,62,73,84,95}




23 4 23