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ab lub ba lub aa lub bb
10a+b+10b+a+11a+11b=220
22a+22b=220/:22
a+b=10
a-b=2
-------- +
2a=12
a=6
b=10-6=4
Odp. Sa to cyfry 6 i 4.
y - druga cyfra
x-y=2
Moga być to liczby: xx yy xy yx
10x+x+10y+y+10x+y+10y+x=220
22x+22y=220 /:22
x+y=10
/x-y=2
\x+y=10
/x=2+y
\2+2y=10
/x-y=2
\2y=8
/x-4=2
\y=4
/x=6
\y=4
Sprawdzenie:
44+66+46+64=220