1
4
+
2
4
=
1-
1
8
=
3
8
+
5
8
=
9
10
-
3
10
=
7
9
-
4
9
=
1-
5
7
=
5
6
+
1
6
=
3
5
-
2
5
=
分析:此題屬于同分母分數(shù)的加減法,只把分子相加減,分母不變,據(jù)此解答.但要注意“1”應(yīng)劃成與分數(shù)分母相同的分數(shù),再計算.
解答:解:
1
4
+
2
4
=
3
4
                        1-
1
8
=
7
8
                                   
3
8
+
5
8
=1
9
10
-
3
10
=
3
5
                         
7
9
-
4
9
=
1
3
                                   1-
5
7
=
2
7

5
6
+
1
6
=1                            
3
5
-
2
5
=
1
5
點評:此題考查了同分母分數(shù)的加減法,掌握方法,很容易解決.
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