在下面的横线里填上合适的数.(1) 5 7 ×______=1;(2)9×______=1;(3) 7 12

2025-04-28 19:25:25
推荐回答(1个)
回答1:

(1)
5
7
×
7
5
=1;
(2)9×
1
9
=1;
(3)
7
12
×
12
7
=1;
(4)
1
12
×12=1;
(5)18×
1
18
=1

(6)
19
17
×
17
19
=1

(7)
1
2
×2=3×
1
3
=
1
4
×4=5×
1
5

故答案为:
7
5
1
9
12
7
1
12
;18;
19
17
;2,3,4,5.