题目内容
计算:(
+
+
)×(
+
+
)-(
+
+
+
)×(
+
)=______.
| 5 |
| 12 |
| 7 |
| 32 |
| 3 |
| 17 |
| 7 |
| 32 |
| 3 |
| 17 |
| 4 |
| 13 |
| 5 |
| 12 |
| 7 |
| 32 |
| 3 |
| 17 |
| 4 |
| 13 |
| 7 |
| 32 |
| 3 |
| 17 |
设a=
+
+
、b=
+
,
则有:(
+
+
)×(
+
+
)-(
+
+
+
)×(
+
)
=a×(b+
)-(a+
)×b,
=
(a-b),
=
×(
+
+
-
-
),
=
×
,
=
.
故答案为:
.
| 5 |
| 12 |
| 7 |
| 32 |
| 3 |
| 17 |
| 7 |
| 32 |
| 3 |
| 17 |
则有:(
| 5 |
| 12 |
| 7 |
| 32 |
| 3 |
| 17 |
| 7 |
| 32 |
| 3 |
| 17 |
| 4 |
| 13 |
| 5 |
| 12 |
| 7 |
| 32 |
| 3 |
| 17 |
| 4 |
| 13 |
| 7 |
| 32 |
| 3 |
| 17 |
=a×(b+
| 4 |
| 13 |
| 4 |
| 13 |
=
| 4 |
| 13 |
=
| 4 |
| 13 |
| 5 |
| 12 |
| 7 |
| 32 |
| 3 |
| 17 |
| 7 |
| 32 |
| 3 |
| 17 |
=
| 4 |
| 13 |
| 5 |
| 12 |
=
| 5 |
| 39 |
故答案为:
| 5 |
| 39 |
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