25×8=
8.5-3.7=
0.56÷0.07=
4×9.2×0.25=
5
6
-
2
3
=
2
3
+
1
5
=
5
8
-
3
4
+
3
8
=
14
1.5
-
3
7
=
3
5
+
1
7
=
分析:根據(jù)整數(shù)、小數(shù)和分?jǐn)?shù)加減乘除的計(jì)算方法進(jìn)行計(jì)算.
4×9.2×0.25根據(jù)乘法交換律進(jìn)行簡(jiǎn)算;
5
8
-
3
4
+
3
8
根據(jù)加法交換律進(jìn)行簡(jiǎn)算.
解答:解:
25×8=200,
8.5-3.7=4.8,
0.56÷0.07=8,
4×9.2×0.25=9.2,
5
6
-
2
3
=
1
6
,
2
3
+
1
5
=
13
15
,
5
8
-
3
4
+
3
8
=
1
4
,
14
1.5
-
3
7
=
187
21
,
3
5
+
1
7
=
26
35
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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