a-b |
2 |
x(x+3) |
x |
5+x |
π |
a+b |
a-b |
1 |
m |
A.1个 | B.2个 | C.3个 | D.4个 |
x(x+3) |
x |
a+b |
a-b |
1 |
m |
2x-4 |
x+1 |
x+1 |
x+3 |
A.x>3 | B.x<3 | C.x≠3 | D.x≠-3 |
3 |
x-2 |
A.x≠2 | B.x≠-2 | C.x>-2 | D.x>2 |
1 |
a |
3a2b3c |
4 |
5 |
6+x |
x |
7 |
y |
8 |
x2 |
x |
A.5 | B.4 | C.3 | D.2 |
1 |
x-3 |
A.x>3 | B.x<3 | C.x≠3 | D.x≠-3 |
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