题目内容
9
×8+ 8
×7+7
×6+6
×5.
| 7 |
| 8 |
| 6 |
| 7 |
| 5 |
| 6 |
| 4 |
| 5 |
9
×8+ 8
×7+7
×6+6
×5
=(9+
)×8+(8+
)×7+(7+
)×6+(6+
)×5
=72+7+56+6+42+5+30+4
=222.
| 7 |
| 8 |
| 6 |
| 7 |
| 5 |
| 6 |
| 4 |
| 5 |
=(9+
| 7 |
| 8 |
| 6 |
| 7 |
| 5 |
| 6 |
| 4 |
| 5 |
=72+7+56+6+42+5+30+4
=222.
练习册系列答案
相关题目