题目内容
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分析:首先把同分母的分数相加,然后从左到右进行加减运算即可.
解答:解:原式=(
+
)-
-
=1-
-
=
-
=-
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=1-
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=
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=-
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点评:本题主要考查有理数的异分母分数加减混合运算,通分是解题的关键.
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