1
3
+
1
3
5
7
-
3
7
3
4
+
1
4
1
2
+
1
2
7
9
-
5
9
3
5
-
1
5
分析:利用同分母分?jǐn)?shù)加減法計(jì)算法則:分母不變,只把分子相加減,直接計(jì)算即可.
解答:
解:
1
3
+
1
3
=
2
3
5
7
-
3
7
=
2
7
3
4
+
1
4
=1
1
2
+
1
2
=1
7
9
-
5
9
=
2
9
3
5
-
1
5
=
2
5
點(diǎn)評(píng):此題考查同分母分?jǐn)?shù)加減法計(jì)算方法,注意結(jié)算結(jié)果的化簡(jiǎn).
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