100000a+10000b+1000c+100a+10b+c:(10a+b)=10010
100000a+10000b+1000c+100a+10b+c=100100a+10010b
100100a+10010b+1001c=100100a+10010b
trừ cả hai vế cho 100100a+10010b
1001c=0
Vậy suy ra c=0
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