题目内容
计算:3(a2b-ab2)+[
a2b-
(a2b-ab2)]-[
ab2+
(a2b-ab2)].
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分析:先去括号,再合并同类项即可.
解答:解:原式=3a2b-3ab2+[
a2b-
a2b+
ab2]-[
ab2+
a2b-
ab2]
=3a2b-3ab2+
a2b-
a2b+
ab2-
ab2-
a2b+
ab2
=(3+
-
-
)a2b-(3-
+
-
)ab2
=
a2b-
ab2.
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| 8 |
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| 8 |
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=3a2b-3ab2+
| 3 |
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| 8 |
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=(3+
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| 8 |
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=
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点评:本题考查的是整式的加减,熟知整式的加减实质上是合并同类项是解答此题的关键.
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