3 |
4 |
1 |
3 |
1 |
7 |
1 |
7 |
1 |
3 |
7 |
22 |
21 |
22 |
3 |
7 |
3 |
7 |
3 |
7 |
3 |
4 |
3 |
4 |
1 |
3 |
3 |
4 |
3 |
4 |
94 |
15 |
47 |
10 |
22 |
7 |
7 |
22 |
21 |
22 |
22 |
7 |
22 |
3 |
21 |
22 |
22 |
7 |
21 |
22 |
22 |
3 |
3 |
7 |
3 |
7 |
A.(-3)×4×(-5) | B.(-3)×4×0 | C.(-3)×4×(-5)×(-1) | D.3×(-4)×(-5) |
A.4 | B.6 | C.-12 | D.8 |
A.交换律 | B.结合律 |
C.分配律 | D.交换律和结合律 |
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