题目
题型:单选题难度:简单来源:不详
1 |
n |
1 |
2n |
1 |
3n |
A.
| B.
| C.
| D.
|
答案
1 |
n |
1 |
2n |
1 |
3n |
6+3-2 |
6n |
7 |
6n |
核心考点
举一反三
3x |
x-4y |
x+y |
4y-x |
7y |
x-4y |
A.-
| B.
| C.-2 | D.2 |
1 |
a-2 |
4 |
a2-4 |
A.
| B.a+2 | C.
| D.a-2 |
(1)
m-n |
a |
m+n |
a |
(2)
x2 |
x+y |
y2 |
x+y |
6 |
2x |
1 |
x |
(2)
a2 |
a-b |
b2 |
b-a |
x2 |
x-1 |
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