题目内容
(x+
)(x-
)=______.
| 1 |
| 3 |
| 1 |
| 3 |
(x+
)(x-
)=x2-
.
故答案为:x2-
.
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 9 |
故答案为:x2-
| 1 |
| 9 |
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计算-
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| 3 |
| A、-3 | ||
| B、-1 | ||
| C、3 | ||
D、
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题目内容
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| 9 |
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| 1 |
| 3 |
| A、-3 | ||
| B、-1 | ||
| C、3 | ||
D、
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