1、100x+10y+z
2、100y+10x+z
3、(100y+10x+z)-(100x+10y+z)=450
得y-x=5
新三位数是940(941,942,943,...,949);
830(831,832,833,...,839);
720(721,722,723,...,729);
610(611,612,613,...,619);
1、100x+10y+z
2、100y+10x+z
3、(100y+10x+z)-(100x+10y+z)=450
得y-x=5
新三位数是940(941,942,943,...,949);
830(831,832,833,...,839);
720(721,722,723,...,729);
610(611,612,613,...,619);