Răspuns :
[tex]4x5y~cu~2: \\
x~poate~fi~orice~numar~de~la~0~la~9; \\
y~trebuie~sa~fie~numar~par~neaparat; \\
x=\{0,1,2,...9\} \\
y=\{0,2,4,6,8\} \\
Numerele: \\
4050,4052,4054,4056,4058,4150,4152,4154,4156,4158...... \\
4950,4952,4954,4956,4958. \\
4x5y~cu~5: \\
x~poate~fi~orice~numar~de~la~0~la~9; \\
y~trebuie~sa~fie~ori~0,~ori~5; \\
Numerele: \\
4050,4055,4150,4155,4250,4255......4950,4955. \\ \\
4x5y~cu~10: \\
x~poate~fi~orice~numar~de~la~0~la~9; \\
y~trebuie~sa~fie~0; \\
Numerele:[/tex]
[tex]4050,4150,4250,4350,4450,4550,4650,4750,4850,4950.[/tex]
[tex]4050,4150,4250,4350,4450,4550,4650,4750,4850,4950.[/tex]