78×34=2652
7 8
×3 4
----------
3 1 2
2 3 4
----------
2 6 5 2
验算:
3 4
×7 8
----------
2 7 2
2 3 8
----------
2 65 2
65×59=3835
6 5
×5 9
----------
5 8 5
3 2 5
----------
3 8 3 5
验算:
5 9
×6 5
----------
2 9 5
3 5 4
----------
3 8 3 5
83×41=3403
8 3
×4 1
----------
8 3
3 32
----------
3 4 0 3
验算:
4 1
×8 3
----------
1 2 3
3 2 8
----------
3 4 0 3