题目内容

口算
5
8
+
5
8
=
11
12
-
5
12
=
4
21
+
4
21
-
1
21
=		 3+
4
9
=
1
8
+
7
8
=		 1-
1
6
-
5
6
=
5
16
+
3
16
+
5
16
=		 4-
1
6
=
分析：根据分数加减法的计算方法进行计算即可．
解答：解：
5
8
+
5
8
=
5
4
，
11
12
-
5
12
=
1
2
，
4
21
+
4
21
-
1
21
=
1
3
，		 3+
4
9
=3
4
9
，
1
8
+
7
8
=1，		 1-
1
6
-
5
6
=0，
5
16
+
3
16
+
5
16
=
13
16
，		 4-
1
6
=3
5
6
．
点评：口算时，注意运算符号和数据，然后再进一步计算即可．
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4
×
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3
=
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7
÷2=
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6
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3
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4
=
9
10
÷
1
5
=
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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÷
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3
÷
1
2
=		 1×
9
11
=
2
5
÷
1
5
=
1
3
÷
1
3
=		 0×
2
9
÷
1
2
=
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6
×
6
5
=
1
5
÷
1
3
=		 0÷
5
12
=		 1×
1
2
÷
1
2
=

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