题目内容
计算:
-
=______.
| x+2 |
| x+1 |
| x+1 |
| x+2 |
原式=
-
=
=
故答案是:
.
| (x+2)2 |
| (x+1)(x+2) |
| (x+1)2 |
| (x+1)(x+2) |
=
| (x+2)2-(x+1)2 |
| (x+1)(x+2) |
=
| 2x+3 |
| x2+3x+2 |
故答案是:
| 2x+3 |
| x2+3x+2 |
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