题目内容
计算：
+
=______．
| 200小+200口×2009 |
| 200小×2009-1 |
| 2009+200小×2010 |
| 2009×2010-1 |
| 2着着3+2着着7×2着着u |
| 2着着3×2着着u-1 |
| 2着着u+2着着3×2着1着 |
| 2着着u×2着1着-1 |
=
| 2着着3+2着着7×2着着u |
| 2着着7×2着着u+2着着u-1 |
| 2着着u+2着着3×2着1着 |
| 2着着3×2着1着+2着1着-1 |
=
| 2着着3+2着着7×2着着u |
| 2着着7×2着着u+2着着3 |
| 2着着u+2着着3×2着1着 |
| 2着着3×2着1着+2着着u |
=1+1
=2．
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