题目内容

口算：
1
3
-
1
4
=
3
4
+
5
6
=
5
8
×
24
25
=		 1÷
2
5
=		 25×10%=
2
5
÷10=		 25%：
1
8
=		 2-
5
12
-
7
12
=
1
6
+
3
4
+
5
6
+
1
4
=
3
5
×
1
16
+
3
5
×
15
16
=
分析：根据分数、百分数的加减乘除法的运算法则进行计算及求比值．
解答：解：
1
3
-
1
4
=
1
12
3
4
+
5
6
=
19
12
5
8
×
24
25
=
3
5
 1÷
2
5
=2.5		 25×10%=
5
2
2
5
÷10=
1
25
 25%：
1
8
=2		 2-
5
12
-
7
12
=1
1
6
+
3
4
+
5
6
+
1
4
=2
3
5
×
1
16
+
3
5
×
15
16
=
3
5
点评：考查了分数、百分数的四则混合运算及求比值．
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相关题目
口算
1
5
+
3
5
=		 1-
1
3
=
1
4
+
3
4
=
1
8
+
5
8
=
5
6
-
2
3
=
7
9
-
2
9
=
11
12
-
1
12
=
7
15
-
2
15
=
13
20
-
9
20
=
9
14
-
5
14
=
口算．
1
3
-
1
4
=		 5-
5
7
=
4
27
×
9
16
=		 2-
2
3
×2=
1
2
-
1
6
=
3
5
+
4
5
=
3
4
+
1
5
=		 12-
3
8
=
4
5
×
3
2
=		 1+
3
2
×
2
3
=
口算．
1
3
+
1
4
=
1
5
-
1
6
=		 1-
5
8
=
1
4
+
1
5
=
2
7
+
1
3
=		 1-
7
15
=
3
4
-
1
6
=
7
10
-
1
2
=
3
8
-
1
4
=
5
9
-
4
9
=
1
2
-
1
4
=		 1-
13
13
=
口算．
1
3
-
1
4
=
1
5
-
1
10
=
7
9
×
6
7
=
6
7
÷6=
12
13
×26=
1÷
5
6
=
3
4
÷
1
8
=		 28×
3
4
=
7
8
×
4
7
=
2
5
×99+
2
5
=
14÷
1
5
=		 (
2
3
-
1
2
)×12=		 1÷
1
4
×4=		 15×
1
3
=
1
3
+
2
13
×
13
14
=
口算．
13×0.4=		 1.3×5= 2.14×0.6= 3.48+0.8=
2.8×0.7= 0.125×8= 0.25×4= 1.69×0.06=
68.7×0= 0.72÷9= 0.55÷1.1= 0.6×50=

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