(a-b-c)2 |
(c-a-b)2 |
(a-b-c)2 |
(c-a-b)2 |
x-π |
π-x |
x-1 |
π |
A.1-
| B.1+
| C.
| D.无法确定的 |
(x-1)2 |
(2-x)2 |
A.1 | B.3-2x | C.2x-3 | D.-2 |
a2+b |
|
x2-xy |
12abc |
8 |
19 |
0.2 |
A.1个 | B.2个 | C.3个 | D.4个 |
-a3b |
-a3b |
A.-a
| B.-a
| C.a
| D.a
|
19-8
|
4+2
|
A.2+
| B.
| C.3 | D.5 |
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