3
4
+
1
4
=
 
5
6
-
1
6
=
 
2+
4
9
=
 
1-
7
12
=
 
3-
2
3
=
 
3
4
-
1
2
=
 
2
3
 +
1
5
=
 
 
7
8
+
3
8
=
 
2-
3
5
=
 
1
3
+
1
4
=
 
1
7
+
6
7
=
 
1
2
-
1
3
=
 
3
10
+
1
5
=
 
2
3
+
1
6
=
 
4
5
-
1
5
=
 
2.9+3.7+2.1=
 
1
4
+
1
3
+
3
4
=
 
2-
1
6
-
5
6
=
 
9.2×0.25×4=
 
1
6
+
1
2
+
1
6
=
 
分析:根據(jù)分?jǐn)?shù)加減法和小數(shù)加法與乘法的計(jì)算方法進(jìn)行計(jì)算.
2.9+3.7+2.1、
1
4
+
1
3
+
3
4
、
1
6
+
1
2
+
1
6
根據(jù)加法交換律進(jìn)行簡算;
2-
1
6
-
5
6
根據(jù)減法的性質(zhì)進(jìn)行簡算;
9.2×0.25×4根據(jù)乘法結(jié)合律進(jìn)行簡算.
解答:解:
3
4
+
1
4
=1
5
6
-
1
6
=
2
3
2+
4
9
=2
4
9
1-
7
12
=
5
12
3-
2
3
=2
1
3
3
4
-
1
2
=
1
4
2
3
 +
1
5
=
13
15
 
7
8
+
3
8
=
5
4
2-
3
5
=1
2
5
1
3
+
1
4
=
7
12
1
7
+
6
7
=1
1
2
-
1
3
=
1
6
3
10
+
1
5
=
1
2
2
3
+
1
6
=
5
6
4
5
-
1
5
=
3
5
2.9+3.7+2.1=8.7
1
4
+
1
3
+
3
4
=1
1
3
2-
1
6
-
5
6
=1
9.2×0.25×4=9.2
1
6
+
1
2
+
1
6
=
5
6
點(diǎn)評:口算時,注意運(yùn)算符號和數(shù)據(jù),然后再進(jìn)一步計(jì)算.
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