2
5
+
2
7
-
2
5
+
2
7
的結(jié)果是( 。
分析:根據(jù)算式的特點(diǎn),可交換
2
7
與-
2
5
的位置,把原式改寫為:
2
5
-
2
5
+
2
7
+
2
7
,然后再按照分?jǐn)?shù)加減法的計(jì)算方法進(jìn)行計(jì)算即可.
解答:解::
2
5
+
2
7
-
2
5
+
2
7
,
=
2
5
-
2
5
+
2
7
+
2
7
,
=
2
7
+
2
7
,
=
4
7

故選:C.
點(diǎn)評(píng):此題主要考查的是在分?jǐn)?shù)加減法中簡(jiǎn)便運(yùn)算方法的應(yīng)用.
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