Question

abc5 - 1107 =5abc

Answer 1

abc=678

Answer 2

abc5-1107=5abc

Phân tích từng số ra nhé

abc5=1000a+100b+10c+5

5abc=5000+100a+10b+c

1000a+100b+10c+5-1107=5000+100a+10b+c

900a+90b+9c+5-1107=5000

           900a+90b+9c=5000+1107-5

           900a+90b+9c=6102

         9.(100a+10b+c)=6102

              100a+10b+c=6102:9

              100a+10b+c=678

              100a+10b+c=100.6+10.7+1.8

Vậy a=6

       b=7

       c=8

Số cần tìm abc=678