题目内容

15÷
4
5
+15÷
1
5
=15÷(
4
5
+
1
5
)=15．
×
×
．（判断对错）
分析：通过观察，此题应先算除法，再算加法．而原题中错用了除法的性质，除法的性质应是除数相同，而不是被除数相同，即（a+b）÷c=a÷c+b÷c．
解答：解：15÷
4
5
+15÷
1
5

=15×
5
4
+15×5
=
75
4
+75
=18
3
4
+75
=93
3
4
．
故答案为：×．
点评：此题考查了学生对除法运算性质的掌握与运用．
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38×89=
3382
3382
 15+45=
60
60
 1.03+0.07=
1.1
1.1
 1-12-14=
-25
-25
14×25%=
3.5
3.5
 （13+1）÷113=
14
113
14
113
 0.6：0.36=
5
3
5
3
．
直接写出得数
15+
4
5
-15+
4
5
=		 12×
1
7
÷12×
1
7
=		 8.5-（
5
9
-1.5）=
直接写数对又快．
6.8÷17=		 2.5×40= 4-
1
5
+
4
5
=		 15÷1%=
7-3.25= 0.5-
1
5
+0.5-
1
5
=		 0.6÷
3
5
=		 1-0.32=
口算
1
4
×
1
3
=
4
7
÷2=
1
2
÷
1
2
=		 10÷
5
6
=
2
3
×
3
4
=
9
10
÷
1
5
=
1
6
÷6=
8
9
÷4=		 15×
4
5
=		 15÷
1
3
=
3
4
×
2
9
=
2
3
÷
1
2
=
2
5
×
1
2
=
1
2
÷
1
4
=
1
2
×
1
4
=
4
5
÷
1
5
=
3
7
×14=
1
4
÷
1
2
=
1
2
-
1
4
=
4
9
×
3
4
=
5
8
×
2
5
=
1
6
÷
2
3
=
1
2
+
1
4
=
3
5
÷1=
7
15
×5=		 1÷
3
4
=
1
2
÷
1
4
=		 1÷
3
5
=
3
4
×12=
1
5
÷
2
3
=
7
9
×
3
7
=		 1-
3
5
=		 18×
5
6
=		 7÷
7
5
=
1
3
+
1
6
=		 1+
3
5
=
2
9
×
1
4
=
8
3
÷2=
3
5
÷
2
5
=
5
9
÷3=
5
6
×
3
10
=
2
5
÷
1
2
=
8×
1
4
=		 9÷
3
4
=		 30×
1
3
=
4
5
÷2=
5
24
÷
5
6
=
5
8
×
1
2
×0=
1
3
×
3
11
=		 8÷
1
4
=
9
10
÷
3
5
=		 0÷
1
3
÷
1
2
=		 1×
9
11
=
2
5
÷
1
5
=
1
3
÷
1
3
=		 0×
2
9
÷
1
2
=
5
6
×
6
5
=
1
5
÷
1
3
=		 0÷
5
12
=		 1×
1
2
÷
1
2
=
直接写数对又快．
6.8÷17=		 2.5×40= 4-
1
5
+
4
5
=		 15÷1%=
7-3.25= 0.5-
1
5
+0.5-
1
5
=		 0.6÷
3
5
=		 1-0.32=

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