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?jǐn)?shù)四則運(yùn)算的計(jì)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(diǎn)評(píng):此題考查了分?jǐn)?shù)四則運(yùn)算的計(jì)算法則及口算能力.
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