先设定该数字的后三数的数字分别为x、y、z,那么,该数目为
100000x+1000y+1000z+100x+10y+z
=100100x+10010y+1001z
=1001(100x+10y+z)
又因为
7*11*13=1001
即
7*11*13=1001(100x+10y+z)
问题得证
先设定该数字的后三数的数字分别为x、y、z,那么,该数目为
100000x+1000y+1000z+100x+10y+z
=100100x+10010y+1001z
=1001(100x+10y+z)
又因为
7*11*13=1001
即
7*11*13=1001(100x+10y+z)
问题得证