口算:
3
4
+
1
2
=
1
3
-
1
4
=
12×
3
4
=
1
5
÷3=
20÷
4
9
=
5
7
÷1=
2
3
×
7
8
=
7
10
×
3
10
+
3
10
×
3
10
=
分析:根據(jù)分?jǐn)?shù)加減乘除的計(jì)算方法進(jìn)行計(jì)算.
7
10
×
3
10
+
3
10
×
3
10
根據(jù)乘法分配律進(jìn)行簡(jiǎn)算.
解答:解:
3
4
+
1
2
=
5
4
1
3
-
1
4
=
1
12
12×
3
4
=9
1
5
÷3=
1
15
20÷
4
9
=45
5
7
÷1=
5
7
2
3
×
7
8
=
7
12
7
10
×
3
10
+
3
10
×
3
10
=
3
10
點(diǎn)評(píng):口算時(shí),注意運(yùn)算符號(hào)和數(shù)據(jù),然后再進(jìn)一步計(jì)算.
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