题目内容

口算
1
4
+
1
3
=
1
3
-
1
5
=		 1÷
1
9
=
2
27
×9=
12
17
÷12=
2
9
×
3
4
=
3
4
÷
1
6
=		 0÷
3
8
=		 7.8×9+7.8=
5
6
+
4
11
×0=
24×（
3
8
+
5
6
）=		 12×
2
25
-
24
25
=
分析：根据分数和小数的加减乘除的计算方法进行计算即可；7.8×9+7.8和24×（
3
8
+
5
6
）可以根据乘法分配律进行简算．
解答：解：
1
4
+
1
3
=
7
12
，
1
3
-
1
5
=
2
15
，		 1÷
1
9
=9，
2
27
×9=
2
3
，
12
17
÷12=
1
17
，
2
9
×
3
4
=
1
6
，
3
4
÷
1
6
=
9
2
，		 0÷
3
8
=0，		 7.8×9+7.8=78，
5
6
+
4
11
×0=
5
6
，
24×（
3
8
+
5
6
）=29，		 12×
2
25
-
24
25
=0．
点评：口算时，注意给出的数据和计算的符号，能简算的要简算．
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（1）7.2+2.08=
（2）
1
3
+
1
4
=
（3）
7
10
÷
1
2
=
（4）0÷0.99=
（5）32×0.125=
（6）0.75×3÷
3
4
=
（7）
1
5
+3.2÷16×4=
（8）
1
2
-
1
2
×
1
2
=
（9）0.8÷0.01=
（10）10×
1
3
-1÷3=
（11）8.4÷0.7=
（12）
2
3
×5÷
2
3
×5
（13）0.23=
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
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
=

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