a |
b |
n |
|
|
|
1 |
2 |
2 |
1 |
4 |
|
3 |
-2 |
3 |
27 |
|
-216 |
|
|
4 |
|
|
|
=
|
运算的依据 () (乘法交换律、结合律) |