题目内容

直接写出得数．
7
9
-
4
9
=
1
10
+
3
10
=
3
8
+
5
8
=
5
6
-
1
6
=
2
3
-
1
4
=
1
2
-
1
3
=		 1-
2
7
=
1
2
+
1
6
=
分析：同分母分数相加减，分母不变，只把分子相加减；异分母分数相加减，先通分，化成同分母分数，然后再根据同分母分数加减法的计算方法进行计算．
解答：解：
7
9
-
4
9
=
1
3
1
10
+
3
10
=
2
5
3
8
+
5
8
=1
5
6
-
1
6
=
2
3
2
3
-
1
4
=
5
12
1
2
-
1
3
=
1
6
 1-
2
7
=
5
7
1
2
+
1
6
=
2
3
点评：口算时，注意运算符号和数据，然后再进一步计算．
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7
×
7
9
=		 1-
8
11
=
4
5
÷
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8
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直接写出得数．
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+
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（2010?泸县模拟）
直接写出得数．
7
9
×18=
5
9
÷
5
6
=
6
11
×
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12
=
5
6
×
3
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1÷9÷
1
9
=
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10
÷
7
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8
9
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3
×
1
3
÷
1
3
×
1
3
=
直接写出得数．
①
7
9
÷7=		 ②1÷
1
4
=		 ③
3
4
×8=		 ④
7
20
×
6
7
=
⑤
4
5
+
1
5
=		 ⑥
5
6
×
5
6
=		 ⑦
1
2
÷50%=		 ⑧36÷
1
6
=
直接写出得数．
7
9
÷
4
9
=		 1÷
3
10
=
3
8
×
5
9
=
1
6
×8=
1
3
-
1
4
=
1
2
÷
1
3
=		 1÷
2
7
=
1
2
÷6=

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