题目内容
求值：
+
+
=______．
| 919191 |
| 393939 |
| 910910 |
| 390390 |
| 91009100 |
| 39003900 |
设91=x，39=y，
原式=
+
+
=
+
+
=3×
=7．
原式=
| 10000x+100x+x |
| 10000y+100y+y |
| 10000x+10x |
| 10000y+10y |
| 1000000x+100x |
| 1000000y+100y |
=
| x |
| y |
| x |
| y |
| x |
| y |
| 91 |
| 39 |
练习册系列答案
相关题目