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0.45+0.45+0.45+0.45+0.45=
0.45
0.45
×
5
5
分析:本题根据乘法的意义进行分析填空即可:
乘法的意义为:求几个相同加数和的简便计算.所以,45+0.45+0.45+0.45+0.45=0.45×5.
解答:解:45+0.45+0.45+0.45+0.45=0.45×5.
故答案为:0.45,5.
点评:本题通过具体算式考查了学生对于乘法意义的理解与应用.
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3
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1
4
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5
6
÷
1
6
=
4
5
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3
5
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1
6
÷
5
6
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5-
1
6
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7
20
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4
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1
6
+
1
5
=
3
5
×
1
6
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1
2
×
4
5
=
1
6
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1
2
×
2
5
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1
4
-
1
5
=
5
8
-
1
4
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9
10
-
9
20
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2
3
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1
8
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1
5
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50
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7
8
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3
4
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1
3
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6
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5
6
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5
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3
10
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3
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5
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1
5
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3
2
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3
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2
5
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1
10
+
3
5
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6
7
-
1
5
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7
8
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6
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