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d) aflati a si b, nr. naturale,stiibd ca: {a,2a+3,2a+5,21}={6,15,17,b+2}

Răspuns :

[tex] b+2=21\implies b=19 [/tex]

[tex] a=6 [/tex]

[tex] 2a+3=15 [/tex]

[tex] 2a+5=17. [/tex]