求详细解答过程!

2024-12-18 13:42:24
推荐回答(1个)
回答1:

(1)
1 2 3
=1ⅹ 4 5 6ⅹ (-1)
7 8 9

1 2 3
=-1ⅹ 2 1 0
4 2 0
=-1ⅹ0
=0