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aflati a si b stiind ca ab3+5ab+b7a=906

Răspuns :

100a+10b+3+500+10a+b+100b+70+a=906
111a+111b+573=906
111(a+b)=333
a+b=3
Fie a=1 => b=2 , numerele fiind 123; 512; 271 (123+512+271=906)
Fie a=2 => b=1 , numerele fiind 213; 521; 172 (213+521+172=906)