3 |
x+2 |
1 |
x-2 |
2x |
x2-4 |
1 |
x+1 |
x2-x |
x2-2x-3 |
x |
x-3 |
3(x-2)-(x+2)+2x |
(x+2)(x-2) |
4(x-2) |
(x+2)(x-2) |
4 |
x+2 |
1 |
x+1 |
x(x-1) |
(x-3)(x+1) |
x-3 |
x |
1+x-1 |
x+1 |
x |
x+1 |
A.6 | B.1 | C.-1 | D.-6 |
A.一定为负数 |
B.一定是正数 |
C.可能是正数,可能为负数 |
D.可能为零 |
A.1 | B.-1 | C.0 | D.(-1)m+1 |
a |
x |
A.1个 | B.2个 | C.3个 | D.4个 |
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