12345679×(9×1+1)=123456790有什么发现?
12345679×（9×2+1）=234567901
12345679×（9×3+1）=345679012
12345679×（9×4+1）=456790123
12345679×（9×5+1）=567901234
12345679×（9×6+1）=679012345