a x 11 x 1b = c00c
a x11 x 10 + b = c x 1000 + c
a x 110 + b = cx 1001
ab x 110 = 1001 x c
ab x ( 100 + 10 ) = ( 1000 + 1 ) x c
ab x 100 + ab x 10 = 1000 x c
2 x 1000 = 1000 x c
2000 = 1000 x c
c = 2000 - 1000
c = 2
Nếu c = 2 ta có :
aa x 1b = 2002
a x 11 x 10 xb = 2002
ab x ( 11 x 10 ) = 2002
ab x 11 + ab x 10 = 2002
ab x 11 x 10 = 2002
ab x 10 = 2002 : 11
ab x 10 = 182
ab x ( 9 + 1 ) = 182
ab x 9 = 182
ab x ( 8 + 1 ) = 182
ab x 8 = 182
ab x ( 7 + 1 ) = 182
ab x 7 = 182
ab = 182 : 7
ab = 26
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