口算．
1
3
-
1
4
=		 5-
5
7
=
4
27
×
9
16
=		 2-
2
3
×2=
1
2
-
1
6
=
3
5
+
4
5
=
3
4
+
1
5
=		 12-
3
8
=
4
5
×
3
2
=		 1+
3
2
×
2
3
=
分析：根據(jù)分數(shù)四則運算的計算法則口算即可．
解答：解：
1
3
-
1
4
=
1
12
 5-
5
7
=4
2
7
4
27
×
9
16
=
1
12
 2-
2
3
×2=
2
3
1
2
-
1
6
=
1
3
3
5
+
4
5
=
7
5
3
4
+
1
5
=
19
20
 12-
3
8
=11
5
8
4
5
×
3
2
=
6
5
 1+
3
2
×
2
3
=2．
點評：此題考查了分數(shù)四則運算的計算法則及口算能力．
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