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Determina numerele naturale de forma ab, stiind ca ab + ba = 99.

Răspuns :

ab=45,54,72,27,63,36,18,81,
ba=54,45,27,72,36,63,81,18
10×a+b +10×b +a =11×(a+b)= 99
99÷11 =a+b
a+b=9
a €( 1,2,3,4,5,6,7,8)
b €( 1,2,3,4,5,6,7,8)