7 |
5 |
12xy2 |
27x3y4 |
1 |
2 |
|
|2-x| | ||
|
1 | ||
|
x2-x | ||
x+
|
x2-x |
4-x |
A.1个 | B.2个 | C.3个 | D.4个 |
2 |
7 |
112 |
5 |
125 |
12xy2 |
3x |
27x3y4 |
3x |
1 |
2 |
|
1 |
6x |
3x |
|2-x| | ||
|
1 | ||
|
x2-x | ||
x+
|
x-2 |
4-x |
| ||
x-4 |
x(x-1) | ||
x+
|
x+
| ||
4-x |
x2-x | ||
x+
|
x2-x |
4-x |
2 |
| ||
3 |
| ||
3 |
A.加号 | B.减号 | C.乘号 | D.除号 |
3 |
13 |
2 |
A.
| B.0 | C.-1 | D.π |
13 |
2 |
17 |
6 |
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