题目内容
51
×
+71
×
+91
×
.
| 2 |
| 3 |
| 3 |
| 5 |
| 3 |
| 4 |
| 4 |
| 7 |
| 4 |
| 5 |
| 5 |
| 9 |
51
×
+71
×
+91
×
,
=(50+
)×
+(70+
)×
+(90+
)×
,
=50×
+
×
+70×
+
×
+90×
+
×
,
=31+41+51,
=123;
故答案为:123.
| 2 |
| 3 |
| 3 |
| 5 |
| 3 |
| 4 |
| 4 |
| 7 |
| 4 |
| 5 |
| 5 |
| 9 |
=(50+
| 5 |
| 3 |
| 3 |
| 5 |
| 7 |
| 4 |
| 4 |
| 7 |
| 9 |
| 5 |
| 5 |
| 9 |
=50×
| 3 |
| 5 |
| 5 |
| 3 |
| 3 |
| 5 |
| 4 |
| 7 |
| 7 |
| 4 |
| 4 |
| 7 |
| 5 |
| 9 |
| 9 |
| 5 |
| 5 |
| 9 |
=31+41+51,
=123;
故答案为:123.
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