Question

Scrie toate numerele mai mici sau egale cu 30 de forma xy stiind ca x+y=3

Answer 1

[tex]xy \leq 30~|~y+x=3\\ xy=30=\ \textgreater \ 3+0=3(CORECT)\\ xy=29=\ \textgreater \ 9+2=11(INCORECT)\\ xy=28=\ \textgreater \ 8+2=10(INCORECT)\\ xy=27=\ \textgreater \ 7+2=9(INCORECT)\\ xy=26=\ \textgreater \ 6+2=8(INCORECT)\\ xy=25=\ \textgreater \ 5+2=7(INCORECT)\\ xy=24=\ \textgreater \ 4+2=6(INCORECT)\\ xy=23=\ \textgreater \ 3+2=5(INCORECT)\\ xy=22=\ \textgreater \ 2+2=4(INCORECT)\\ xy=21=\ \textgreater \ 1+2=3(CORECT)\\ ---------\\ xy=13=\ \textgreater \ 1+3=4(INCORECT)\\ xy=12=\ \textgreater \ 1+2=3(CORECT)\\ --------\\ xy=10=\ \textgreater \ 1+0=1(INCORECT)\\\\ Numerele~xy \leq 30~|~x+y=3~sunt:30;21;12\\ OBSERVATIE!Numerele~30,21,12|3[/tex]

Answer 2

x poate fi : 1; 2; 3 ;
daca x+y=3 
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xy = { 12 ; 21 ; 30  }