题目内容
999
+
+
+3×
.
| 4 |
| 5 |
| 994 |
| 5 |
| 94 |
| 5 |
| 1 |
| 5 |
999
+
+
+3×
,
=(1000-
)+(199-
)+(19-
)+
,
=(1000+199+99)-
+
,
=(1000+200-1+100-1),
=1300-2,
=1298.
| 4 |
| 5 |
| 994 |
| 5 |
| 94 |
| 5 |
| 1 |
| 5 |
=(1000-
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 3 |
| 5 |
=(1000+199+99)-
| 3 |
| 5 |
| 3 |
| 5 |
=(1000+200-1+100-1),
=1300-2,
=1298.
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