1 |
5-x |
A.x>5 | B.x<5 | C.x=5 | D.x≠5 |
1 |
5-x |
2-x |
x+2 |
A.x=2 | B.x=-2 | C.x≠2 | D.x≠-2 |
1 |
3 |
1 |
2 |
1 |
xy |
1 |
5+a |
x |
x2 |
x |
π |
10 |
y |
A.1个 | B.2个 | C.3个 | D.4个 |
x |
2 |
y |
2x2 |
y |
π-1 |
y2-1 |
(x-1)2 |
A.1 | B.2 | C.3 | D.4 |
x2(ax5+bx3+cx) |
x4+dx2 |
A.1 | B.-1 | C.0 | D.2 |
x+2y |
x2-4y2 |
3a2-ab |
9a2-6ab+b2 |
3 |
4 |
2 |
3 |
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